Check whether the following numbers are in proportion or not
a) 8, 20, 6 and 15
b) 9, 12 and 16
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Answer:
a) 8:20::6:15
8×15=120
20×6=120
The product of means is equal to the product of extremes
So, the 8,20,6 and 15 are in proportion
b) 9:12::12:16
9×16=144
12×12=144
The product of means is equal to the product of extremes
So, the 9, 12 and 16 are in proportion
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