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twenty1randomletters
for your first question: find a common denominator first
for your second question :whats 360 divided by 30??
apologiabiology
1.
make denom same
7/8 and 1/2
8 is common
1/2 times 4/4=4/8

7/8-1/2=7/8-4/8=3/8



2.
time/degrees
10/30=t/360
1/3=t/360
times both sides by 360
120=t

120 seconds or 2min