Math, asked by Miksyme, 6 months ago

(b) The average mass of 4 boys is 45kg. When a fifth boy joins them, the avaerage mass
changes to 40kg. What is the mass of the fifth boy?

Answers

Answered by FlexDeveloperYou

9

Answer:

20 kg

Step-by-step explanation:

mass of all 4 boys = x/4 = 45

x = 4 * 45 = 180

let the mass of fifth boy be y

180+y/5 = 40

y = 20

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