Question

there is 4/5 lb of sand in science supplies. if one scoop of sand weighs 1/20 of a lb how many scoops of sand can maria get from the class supplies?

Answer 1

6, because 4/5 = 8/10 - 5/10 = 3/10 x 2 = 6/20 divided by 1/20 = 6 scoops

Answer 2

We want to divide whole sand into scoops, so we have to divide 4/5 by 1/20. Lets do this


`( (4)/(5) )/( (1)/(20) )`
We know that if we want to divide 2 fraction we can multiply first by inverse of second fraction instead of dividing.,so:

`( (4)/(5) )/( (1)/(20) )`

`(4)/(5)* (20)/(1)= (4*20)/(5*1) = (80)/(5)= 16` scoops - its our result.