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P:q=2/3:5/6 and q:r=3/4:1:2,find p:q:r​

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5 votes

Answer:

p:q:r = 12:15:10

Explanation:

Given p:q = (2/3):(5/6) and q:r = (3/4):(1/2), you want p:q:r.

Integer ratios

We can turn each ratio into a ratio of integers by multiplying by the least common denominator.

p:q = 4:5 . . . . . . . multiply the given ratio by 6

q:r = 3:2 . . . . . . . multiply the given ratio by 4

Now, we need to have q be represented in each ratio by the same number. That number will be the least common multiple of its representations in these ratios: LCM(5, 3) = 15.

Multiplying the first ratio by 3, we have ...

p : q = 12 : 15

Multiplying the second ratio by 5 gives ...

q : r = 15 : 10

Ratios of all three

Now, we can write the ratio of interest:

p : q : r = 12 : 15 : 10

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