Question

At the start of the week, a bookshop had science and art books in the ratio 2:5. By the end of the week, 20% of science books and 45% of art books were sold. If 640 science books and 1100 art books were left unsold. A)Find the total number of books at the bookshop at the start of the week. b)The week after that he decides to add more art books to his collection so as to maintain the ratio of 2:5. Calculate the number of more art books he must add to maintain the ratio.

Answer 1

Answer:

down there

Step-by-step explanation:

Here,

80% = 640

so 100 % is 800

again

55% = 1100

100% is 2000

so at 1st week there was 2800 books.

now...

science books remaining 640 and arts 1100

$\frac{640}{x} = \frac{2}{5}$

x is 1600

so he should add 500 books

I am done.