Question

One-fifth of a number added to one-seventh of it gives 72. Find the number

Answer 1

Answer:Let the number = x

According to the condition

(1/5)x = 5 ⇒ x = 5 x 5

⇒ x = 25

∴ Number = 25

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Answer 2

Answer:

Let the no. be X

1/5 of x + 1/7 of x = 72

= x/5 + x/7 = 72

= 7x + 5x/35 = 72

= 12x = 72*35

= x = 72*35/12

= x = 6*35 = 210. ans.

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