6. 100 people were having a health check at the Jurong Community Club. Their average mass was 63 kg. Given that the average mass of the women was 60 kg and the average mass of the men was 70 kg, how many men were there?
100 x 63 = 6300
100 x 60 = 6000
6300 – 6000 = 300
70 – 60 = 10
300 ÷ 10 = 30 men
There were 30 men.
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