What numbers should be subtracted from each of the numbers 23, 30, 57 and 78 so that remainders are in proportion?
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If a, 12, 16 and b are in continued proportion, find a and b.
What number must be added to each of the numbers 5, 11, 19 and 37 so that they are in proportion?
If k + 3, k + 2, 3k - 7 and 2k - 3 are in proportion, find k.
If (x + 5) is the mean proportion between x + 2 and x + 9, find the value of x.