Question

a.
Four friends have an average weight of 68. If John is also included in the
group, the average weight becomes 72. What is John's weight?​

Answer 1

4kg

Explanation:

because if 4kg is added with 68 then it becomes the total weight 72 so john's weight is 4kg

Answer 2

Answer:

Let the weight of four friends be a,b,c and d and that of John be x.

We have,

(a+b+c+d)/4 = 68

a+b+c+d = 68×4 = 272------(1)

Now,

a+b+c+d+x = 72×5 = 360

272+x = 360

X = 88

Thus, weight of John is 88kg.