121 : 21 :: 100 : ? what is the number in question mark ?
How 10 is possible
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Answer:
17.35
Step-by-step explanation:
Given 121 : 21 :: 100 : x
Given ratio as 121 : 21 is as is to 100 : x
In ratio and proportion, product of means is equal to product of extremes.
21 x 100 = 121 x x
121 x = 2100
x = 2100 / 121
x = 17.35
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