Question

what should be subtracted from 8,15,23and 51 so that the resulting numbers are in proportion
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Answer 1

Let the required number be ‘x’. after subtracting x from the given numbers, we have 23-x, 30-x, 57-x, 78-x.

At this point, you can choose to be lazy and see which option fits, or solve it the “good” way.

(23−x)/(30−x)=(57−x)/(78−x)(23−x)/(30−x)=(57−x)/(78−x)

Transposing, we get

x2−101x+1794=x2−87x+1710x2−101x+1794=x2−87x+1710

14x=8414x=84

x=6x=6

I hope it helps you dear ❣️❣️☺️☺️❤️❤️