What least number must be subtracted from each of 13 16 17 21 to make them in proportion?
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Answer:
Step-by-step explanation:
Let, the required number be x.
To numbers to be in proportion
Product of extremes = Product of meand
(13-x)(21-x) = (16-x)(17-x)
273-13x-21x+x² = 272-16x-17x+x²
273 -34x+x²= 272-33x+x²
273-34x = 272-33x
273-272 = -33x+34x
1 = x
Answer: 1 must be subtracted from each of the number.
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