Question

What number must be subtracted from each term of the ratio 19:21 to make it 7:8
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Answer 1

$let \: the \: no \: be \: substracted \: be \: x \\ \\ so \\ \frac{19}{21} - x = \frac{7}{8} \\ \\ \frac{19 - 21x}{21} = \frac{7}{8} \\ \\ 8(19 - 21x) = 21 \times 7 \\ \\ by \: simplification \: \\ \\ x = 0.875$
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