exam Maths Puzzle Numerical Ability

What is the answer to this question:
square root 20 - square root 5 + 4 square root 8
I tried this:
2 square root 5 - square root 5 + 8 square root 2
square root 5 + 8 square root 2
9 square root 10
18 square root 5

Read Solution (Total 0)

exam Other Question
If the sales tax rate is 6.5% and the tax on a purchase is $39, what was the amount of the purchase? Hi.

What is the least common denominator of the following set:

1/(a+1)^2, 1/(a-1)^2, and 2/a^2-1


Thanks for your help!