**The average mass of Bob and his five friends is 43 kg. Bob is 3 kg heavier than the average mass of his five friends. Find the mass of Bob.Solution**

Total mass of Bob and 5 friends -----

43 kg x 6 = 258 kg

If Bob had been 3 kg less, the total mass would be -----

258 kg – 3 kg = 255 kg

Average ---- 255 kg divided by 6 = 42.5 kg

But since Bob is 3 kg heavier -----

42.5 kg + 3 kg = 45.5 kg

**Answer: The mass of Bob is 45.5 kg.**

## 1 comment:

Hi Mr Song

If Bob had been 3 kg less, the total mass would be -----

258 kg – 3 kg = 255 kg

Why? Any simpler method to solve this problem?

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