the lowest would be 30

so it would be 24/30+20/30+21+30

then just add ans simplify

hope that helps

I arrived at the answer by copying your problem into the Yahoo search engine and hitting enter. However, you really do need to know how to derive at the answer by working the problem.

The website below should help you understand the principle of adding fractions.

Ex: 1/3+7/8 The common denominator is 24 so you multply 1/3 by 8 = 8/24 then mult 7/8 by 3 = 21/24 so 8/24+21/24 =29/24

(if your lazy, type the values above into a calculator and then guess and check to find the solution)

hope you get it solved