Denise L. answered • 01/17/19

Engaging Tutor with over 20+ Years of Helping Students Succeed

Hi Kelly,

When you are doing problems like this, watch the denominators on the fractions --- you can't add or subtract thirds and fifths...you need the same denominator first which you can get by multiplying the two numbers (sometimes there is a smaller least common multiple.)

So here, if 1/3 are science, that is 5/15 science.

If 2/5 are biography, that is 6/15 biography.

The total number of books is 15/15, another way to write 1.

So if the rest are fiction, that would be 15/15 - 5/15 - 6/15 =

Denise L.

03/22/19

Vickey G.

when we add 2/15+6/15= 11/15, how 15/15 come. can you explain please.03/21/19