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Hi,
what is the answer to 3:4=48:b
3:4 is a ratio and can be written as 3/4
48:b = 48/b
3:4=48:b says the two fractions are equal

Solving by cross multiplying:
3b = 4•48
b = 4•48/3 = 4•16
b = 64 is the answer to the value of b
3:4=48:64
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