Question

In a library 1 by 5 are math books 1 by 8 science book 1 by 12 Hindi book and the rest r e v s book if the number of EVS book is 142 find the total number of book in the library without using the value of x

Answer 1

Answer:

210 total books

Step-by-step explanation:

*I am solving it by unitary method*

Recall

Number of maths books = 1/5

Number of science books = 1/8

number of evs books 142

Let the total number of books be 40(LCM of 5 and 8)

Then, number of Maths Books = 8

& number of science books = 5

& number of science books = 40-(5+8)..................total-sum of other books

=27

Total Books               EVS Books

      40                               27

      Unknown                    142

Total Books = (40*142)/27

after solving you get 210 as the answer