Answer
Find out the what fraction of the sandcastle did they build together .
To prove
Let us assume that the fraction of the sandcastle they build together be x .
As given


Than the equation becomes

L.C .M of (3,7) = 21
solving


Therefore the fraction of the sandcastle did they build together be

Hence proved
Answer:
55.5
Step-by-step explanation:
Answer:
4
Step-by-step explanation:
65-25=40
40/10=4
Answer:
Step-by-step explanation: