exam Maths Puzzle Numerical Ability

Identify the rate in the following statement: 27% of 500 is 135.

This is my last one. The Rate would that be 500? I hope...

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SQRT /63 - 2/28 + 5/7

i cant make a sqrt sign. the 63, 28 and 7 are all under the square root sign.

THanks.
The first three terms of the binomial expansion of (a+b)^n are 729,2916,4860 respectively, where a, b, and n are positive integers. Find a, b, n. Show working steps.