exam Maths Puzzle Numerical Ability

solve the proportion 3x 4
-- = --
x + 1 x

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exam Other Question

Can someone help me with this problem?

I need to write 0.21 as a percent.

Thanks,
Lyn Can someone please explain this and dumbify it down - thank you so much in advance:

Multiply:
(5√[2] + 3)(√[2] - 2√[3])