exam Maths Puzzle Numerical Ability

4/52=3/51 how do you solve this? i know how to make it in the form i think but i foregot how to solve it

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exam Other Question

I need help with an exponent problem:
(3a^2 x b^3)^-2x

So far I have 1 over (3a^2 x b^3)(3a^2 x b^3)

But I am not sure what to do next.

Thank you! Identify the rate in the statement
" 72 is 24% of 300."