Maya's school held an aluminum collection program in which they collected aluminum and brought it to be recycled. In the first week, Maya collected 4/20 lb of aluminum and her friend Abigail collected 7/8 lb.

Question

which girl collected more aluminum?
how much aluminum did the two girls collect?

I suck at math please help

Answer 1

4 / 20 = 4 / 4 ∙ 5 = 1 / 5

Least Common Multiple of 5 and 8 is 40

Maya collected :

4 / 20 = 1 / 5 = 8 ∙ 1 / 8 ∙ 5 = 8 / 40 lb

Abigail collected:

7 / 8 = 5 ∙ 7 / 5 ∙ 8 = 35 / 40 lb

35 / 40 > 8 / 40

Abigail collected more aluminum.

Two girls collect:

8 / 40 + 35 / 40 = 43 / 40 = ( 40 + 3 ) / 40 =

40 / 40 + 3 / 40 = 1 + 3 / 40 = 1 + 0.075 = 1.075 lb