Question

The average age of 25 boys in a class
decreases by 6 months when a new boy takes the place of a 20 yr old boy. The age of new boy is ?
(a) 9.5 yr
(b) 7.5 yr
(c) 7.4 yr
(d) 8 yr
​

Answer 1

Answer:

b. 7.5 yr

Step-by-step explanation:

Total reduction in age = 25*6/12

= 12.5 yr

Age of new boy = 20-12.5

= 7.5 yr

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