÷5/7=7/15. step by step, (what divided by 5/7=7/15? )

x = 1/3

Step-by-step explanation:

You are saying that the dividend (the number being divided) is unknown.  Represent it by x:

x ÷ 5/7 = 7/15.  Recall that dividing by 5/7 is the same as multiplying by 7/5, so that

x(7/5) = 7/15.

Here the LCD is 15.  Thus, mult. numerator and denominator of 7x/5 by 3:

21x/15 = 7/15.

Then 21x = 7.  Dividing both sides by 21 isolates x:  x = 7/21, or x = 1/3.

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step-by-step explanation:

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5: 20

step-by-step explanation: