A box contains 42 red counters, 90 yellow counters and no other counters. A group of students share these counters between them so that they each receive the
same number of red counters and the same number of yellow counters.
There are no counters left over,
How many students could be in the group?
Give all possible answers and show your reasoning.

Please help

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

If that's an answer