Math

The cost for each long-distance call includes a $1.15 connection fee plus 40 cents per minute.

If Miranda made two 32-minute long-distance calls and two 56-minute long-distance calls, what was the total cost of the four long-distance calls?

Of the 36 goats on the farm, two-thirds are black, and three-fourths of the black goats have horns.

How many black goats with horns are there on the farm?

The average (arithmetic mean) mass of seven rock samples is 80 grams.

If five of the rock samples have masses of 75 grams, 69 grams, 81 grams, 90 grams, and 73 grams, what is the average mass of the remaining two rock samples?

The elf is 40 centimetres taller than the human, the dwarf is 120 centimetres shorter than the ogre, and the ogre is 40 centimetres taller than the elf. 

The human is how many centimetres taller than the dwarf?

A jar contains 12 000 marbles. 

If 1/3 of the marbles are red, 1/4 of the remaining marbles are blue, and the rest are green, how many green marbles are in the jar?

Jack completed 20 percent of the work, while Jill completed the remainder of the work. 

If each of them were paid the same amount, what fraction of his payment must Jack give to Jill so that they each are paid according to the proportion of their work?

The cost of materials to make each widget is $2.50, and each widget sells for $5. 

If all other expenses related to making widgets total $450, how many widgets must be sold to break even? (Break even is when the total revenue equals total expenses.)

A fruit vendor bought a crate containing 200 oranges for $40. 

If the fruit vendor sold all of the apples for 50 cents each, how much profit did the fruit vendor make? (Profit = Revenue – Expenses)

It costs $300 to produce each microchip, and each microchip sells for $700. 

All other expenses related to producing microchips total $10 000.

If 50 microchips are produced and sold, how much is the profit? (Profit = Revenue – Expenses)

Two cans contain 60 litres of oil. 

If the bigger can contains three times as much oil as the smaller can, how many litres are in the smaller can?

Which number completes the pattern?

Two packs contain 60 marbles. 

If there are 16 more marbles in the first pack than in the second pack, how many marbles are in the first pack?

There are 20 students in the cafeteria. 

If 13 of the students ordered 3 cupcakes each and the remaining students ordered 8 cupcakes each, how many cupcakes did all the students order together?

Two ants are carrying food scraps back into the anthill. 

The first ant carries 5 food scraps, while the second one carries five times as many scraps as the first one.

How many food scraps are the two ants carrying back into the anthill?

Bert and Ernie have 57 baseball cards together. 

If Bert has 7 fewer baseball cards than Ernie, how many baseball cards does Ernie have?

Blossom, Bubbles, and Buttercup were raising money for charity. 

Blossom raised twice the amount that Bubbles raised, and Buttercup raised three times the amount that Bubbles raised.

If Buttercup raised $4 500, what was the average (arithmetic mean) amount of money the three girls raised?

A bus can take 50 tourists per tour, each lasting 30 minutes. 

How long will it take for 350 tourists to complete the tour?

Huey has three times as many stamps as Dewey, and Dewey has 4 fewer stamps than Louie. 

If Louie has 10 stamps, how many stamps does Huey have?

The pine tree is 7 metres taller than the oak tree, which is twice as tall as the maple tree. 

If the maple tree is 8 metres tall, how tall is the pine tree?

The distance between the library and the museum is twice the distance between the library and the art studio. 

The distance between the art studio and the park is two-thirds the distance between the art studio and the library.

If the distance between the art studio and the park is 1.8 kilometres, what is the distance between the library and the museum?

Mickey Mouse is currently three times as old as Minnie Mouse. 

Five years from today, Mickey Mouse will be twice as old as Minnie Mouse.

What is the current age of Minnie Mouse?

Harry, Ron, and Hermione shared a box of 14 nuggets. 

If Harry and Ron ate the same number of nuggets and Hermione ate two more nuggets than Harry, how many nuggets did Hermione eat?

There are 120 employees in the Finance Department. 

The Accounting Department has two-thirds as many employees as the Finance Department, and the Research Department has 10 more employees than the Accounting Department.

What is the total number of employees in the three departments?

Eight boxes of marble are on the display cabinet at the toy store. 

The first box contains 96 marbles, and the last box contains six times as many marbles as the first box.

If the fifth box contains half as many marbles as the last box, how many marbles are in the fifth box?

Goofy cuts a piece of rope 70 metres long into two pieces. 

The first piece is 5 metres longer than one-fourth the length of the second piece.

What is the length of the longer piece?

If 5 apricots cost d dollars, how many dollars, in terms of d, do 25 apricots cost?

Exactly one-third of all the books in Sherlock’s study room are Science books, and exactly one-seventh of the Science books are hard-covered books.

Which of the following could be the total number of books in Sherlock’s study room?

One hundred nails and 200 screws cost $5.

What is the cost of 20 nails and 40 screws at these rates?

Three students are carrying p packs each.

Each pack contains b boxes, and each box contains 50 widgets.

Which of these gives the total number of widgets the three students carry?

Each metal sheet is 0.001 centimetres thick.

How many such metal sheets are needed to make a stack of metal sheets 8 centimetres thick?

Sarah is currently four times as old as Peter.

Six years from today, Peter will be twice as old as Lisa.

If, four years from today, Sarah will be 36 years old, how old will Lisa be six years from today?

Velma, Daphne, and Fred shared a box containing 550 stickers.

If Velma got twice as many stickers as Daphne and three times as many stickers as Fred, how many stickers did Daphne get?

A lily costs half as much as a rose at the flower shop.

If five roses and eight lilies cost $27, how much does each rose cost?

A certain cab charges d dollars for the first kilometre and 2/3d dollars for each succeeding kilometre.

Which of these gives the cost, in dollars, of taking the cab on a 10-kilometre trip?

Captain Jack Sparrow found a treasure chest containing gold and silver coins only in a ratio of 4 to 1, respectively.

How many gold coins are there if the treasure chest contains 50 coins?