Giovanna, frances, and their dad each carried a ten pound bag of soil into the back yard. after putting soil in the first flower bed, giovanna's bag was 5/8 full, frances bag was 2/5 full, and their dad's was 3/4 full. how many pounds of soil did they put in the first flower bed all together (how to work it out)

First find the common denominator
5/8=25/40
2/5=16/40
3/4=30/40
Next you can cross multiply
25/40=x/10 pounds
16/40=x/10 pounds
30/40=x/10 pounds
First
25(10)/40= 6.25 pounds
16(10)/40= 4pounds
30(10)/40= 7.5 pounds
These are the amounts that were left in the bag

10-6.25=3.75
10-4=6
10-7.5=2.5

3.75+6+2.5= 12.25

All together they put 12.25 pounds of soil in the flower bed