a positive number is 5 times another number if 21 is added to both the numbers then one of the new numbers become twice the other new number find the number
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let the smaller number = x
bigger number = 5x. -----(we need this.)
if 21 is added to both; 5x+21 = 2×(x+21)
5x + 21 = 2x + 42
5x - 2x = 42 - 21
3x =. 21
x = 21/3= 7
So the positive number is = 5×7 = 35
answer is 35
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