Question

22. A question bank has questions of Physics and

Chemistry. The number of questions of Chemistry
are 3.5 times the number of questions of Physics.
If there are 90 questions in the question bank, find the
number of questions of Physics and Chemistry in the
question bank.​

Answer 1

3.5x= 3.5×20

= 70

Explanation:

Answer 2

Explanation:

Let the number of books of Physics be x . Then , No. of chemistry books =3.5x

Now , according to question :

x+3.5x=90

Or , 4.5x=90

Or , x=90/4.5

Or , x=20

Now ,

3.5x= 3.5×20

= 70

Therefore , there were 70 chemistry books and 20 physics books in that question bank.