exam Maths Puzzle Numerical Ability

Can someone help me with this problem?

I need to write 0.21 as a percent.

Thanks,
Lyn

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exam Other Question

50km/1h*1h/3600s*/?/=13.9 On the blackboard ,the mathematics professor wrote a polynomial f(x) with integer coefficients and said"today is my son's birthday.when his age A is substituted for x,then f(a)=A,Y