Alexander is three times as old as Jackson and five times as old as Grace. What percentage of Jackson’s age is Grace’s age? A. 30%
B. 40%
C. 50%
D. 60%

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.