• # question_answer What least number must be subtracted from each of the numbers 21, 38, 55 and 106 so that they becomes in proportional. A)  2                    B)  3       C)  4        D)  5

[c] Let number be x $\therefore$ $\frac{21-x}{38-x}=\frac{55-x}{106-x}$ $2226-21x-106x+{{x}^{2}}=2090-38x-55x+{{x}^{2}}$34x = 136 x = 4 $\therefore$ The number is 4