Question

what number must be substrated from each of 15,19,21 and 27 to make them proportional​

Answer 1

Step-by-step explanation:

Let the number to be subtracted be x

According to to question

(15-x):(19-x)::(21-x):(27-x)

Product of means = product of extremes

(15-x)×(27-x)=(19-x)×(21-x)

405 -15x -27x + x2= 399 -19x -21x + x2

405 -42x= 399 -40x ( we cancelled x2 because they had same sign. And we added the x terms)

405 - 399= -40x + 42x

6= 2x

6/2=x

3=x

Lest number to be subtracted = 3

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