Answer:
10
x*(6/10)=6/70
x=6/70*10/6
x=1/7
11
x*2/8=6/32
x=6/32*8/2
x=3/4
12
x*1/5=1/15
x=1/15*5=1/3
13
x*1/7=1/14
x=1/14*7=1/2
14
x*1/2=1/4
x=1/4*2=1/2
15
x*2/5=14/45
x=14/45*5/2
x=7/9
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