Question

the current average of a group of 40 boys is 40% more than the average age of 40 boys five years what will be the group average age , if 2 new boys of 26 year and 30 year join the group.​

Answer 1

Answer:

18

Step-by-step explanation:

Consider average age 5 years before = 100 x

Current average = 140 x (since 40% more)

Difference = 40 x

In 5 years all their age increase by 5 years Hence average also increase by 5.

Now we know 40 x is 5 then what is 100 x

$\frac{5}{40x} \times 100x = 12.5$

Average 5 years before = 12.5

Current Average = 17.5

New average after the addition of new boys$= \frac{17.5 \times 40 + 26 + 30}{42} = 18$

New average = 18