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

The sum of the measures of three angles is 180 degrees and the smallest is
half the size of each of the other two . Find the measure of each
angle. <1 <2 <3 solve the proportion 3x 4
-- = --
x + 1 x