Question

maths plzz fast plzz ​

Answer 1

Step-by-step explanation:

1)Let the total pages of a book be X

Read pages by Guru =1/5 of the total pages

=>X/5

Remaining pages after read

=X-(X/5)

=(5X-X)/5

=4X/5

Remaining pages after read =80

=4X/5=80

=>4X=5×80

=>4X=400

=>X=400/4

=>X=100

Total pages of a book = 100

2)X=1/7 of 49 litres

=>X=49/7 litres

= X=7litres

1/7 of 49 litres is 7 litres