2 answers:
8/15 = 56/105
This may be solved using proportion.
a/b = c/d
ad = bc where cross products are equal.
a = 8
b = f
c = 56
d = 105
ad = bc
8*105 = f*56
840 = 56f
840/56 = 56f/56
f = 15
56 ÷ 7 = 8
105 ÷ 7 = 15
8/f= 56/105
Cross multiply:
56* f= 8*105
⇒ f= 8*105/56= 15
Final answer: f=15~
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