Question

Average weight of 9 boys is 42kg a new biy join the newaverage is42.5kg find the weight of new boy

Answer 1

Answer:

47kg

Step-by-step explanation:

Let Total weight be x

Average=$\frac{Total Weight}{Total no. of students}$

42= $\frac{x}{9}$

x=378                    ...I

Now, when a new boy joins,x=10

42.5=$\frac{x}{10}$

x=42.5x10

x=425                    ...II

Subtracting I from II, we have

Weight of new boy= 425-378

Weight of new boy= 47kg

Thank You:)

Answer 2

Answer:47kg

Step-by-step explanation:in this link below