Closer is a comparative term. Closer than what?
72 is closer to 70 than it is to 70,000,000
72 is not closer to 70 than it is to 73.
Alternatively,
72 is closer to 70 than 70,000,000 is
72 is not closer to 70 than 71 is.
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Work it out: divide 70 by 72, then multiply by 100. (70/72)*100 = 97.222...%
Basic maths - 10% is 7.2 multiply that by 7 and you get 50.4 - all without the aid of a calculator !
The LCM is 2520.
70
The average is 70.