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If the compound ratio of 5:8 and 3:7 is 45:x. Find the value of x.

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If the compound ratio of 5:8 and 3:7 is 45:x. Find the value of x.

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The compound ratio of 5:8 and 3:7

= 5/8 × 3/7=15/56

According to the sum

15 : 56 = 45 : x

∴ x = 168

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