Question

one fourth of a herd of deer has gone forest. one third of total number is grazing in field and remaining 15 are drinking water on the bank of a river. find the total number of deer  

Answer 1

Let the total number of deers be x.
No. of deers in the forest = 1/4x
No. of deers in the field = 1/3x
No. of deers drinking water = 15
Total number of deers = 1/4x + 1/3x + 15 = x
3/12x + 4/12x - x = -15
7/12x - 12x/12 = -15
-5x/12 = -15
5x/12 = 15 (both minuses gets cancelled)
5x = 15 * 12
5x = 180
x = 180/5
= 36
The total number of deers are 36.

Answer 2

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