If y=15 when x=3 over 4,find x when y=25
2 answers:
X = 1 and 1/4 when Y = 25
(3/4) / 15 = x / 25
cross multiply
(15)(x) = (3/4)(25)
15x = 75/4
x = 75/4 * 1/15
x = 75/60 reduces to 5/4 or 1 1/4
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4/10 : 1/25
4/10 / 1/25 = 4/10 x 25/1 = 100/10 = 10.
10 can also be written as 10:1, so A is correct.
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