Question

A number is as much greater than 21 as is less than 71. Find the no.

Answer 1

WRITE the numbers on a horizontal line
21 ------------------------ X ---------------------------------- 71

X is as much greater than 21 as it is less than 71.

It means X is in the center of the two numbers: 21 and 71.

So X = ( 21 + 71 ) /2 = 92 / 2 = 46
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USUAL method

X - 21 = 71 - X take - X to L H S and bring - 21 to R H S

So X + X = 71 + 21

2 X = 92 X = 92 /2 = 46