civonamzuk

x - x/4 - 1/5(3x/4) = 240

x = 400

Each boy had 56 coins.

a)  Jason       ($ 11.20)

b)    $ 5.60                 ( $16.80 - $11.20 )

c)    Keith had 40 twenty-cent coins at first.

There is a triangle ABC, and there are 3 equilateral triangles such that each side of ABC is the base of one equilateral triangle, and the equilateral triangles are facing outwards(is not overlapping ABC).

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I didn't know this. 

y / 14 = (y + 15) / 22

The ratio of the number of chocolate cakes to the total number of cakes sold in a shop was 3:8. 1/2 of the remaining cakes in the shop were cheesecakes and the rest were lemon cakes and vanilla cakes in the ratio of 2:1. There were 120 more cheesecakes than vanilla cakes in the shop.

(a)  How many chocolate cakes were there?

(b)  All the chocolate cakes were sold at 2 for $5. How much money was collected from selling all the chocolate cakes?

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Something's wrong with this question. 

The only connection between chocolate cakes and the rest of the cakes is this:

The ratio of the number of chocolate cakes to the total number of cakes sold in a shop was 3:8. 

In the class library, 3/5 of the books are fiction books. 2/3 of the remaining books are non-fiction books. The rest are magazines. There are 10 fewer magazines than non-fiction books in the class library. How many fiction books are there altogether?

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x    => all books and magazines

3x/5   => fiction books

2/3(x - 3x/5)    => non fiction books

2/3(x - 3x/5) - 10    => magazines

I'm sure you can find your answer. 

At my office, 16 people own cats, 11 people own dogs, and 7 people own both cats and dogs. How many people own a cat or a dog?

(Remember that in mathematics, the word "or" is used in the inclusive sense. So if you own both a cat and a dog, then you are included in the category of people "who own a cat or a dog".)

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There are 20 people who own cats and dogs. 

(16 - 7) + (11 - 7) = 13

Soo, only 13 people own a cat or a dog. 

7 people own both cats and dogs.

On Monday Farhan sold 150 buns. On Tuesday he sold 1/4 of the remainder. Then he had 1/3 of the buns left. How many buns did he have at first?

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Total buns => x

This question is similar to this::::: https://web2.0calc.com/questions/fractions_97630

In the primary school library, there were 221 more fiction books than non-fiction books. If 3/5
of the non-fiction books and 4/7 of the fiction books were borrowed, the remaining fiction
books will be twice as much as the non-fiction books. Find the number of non-fiction books in the library at first.

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Fiction books => 221+x               Non-fiction books => x

There are 255 non-fiction books.