Explain how you can find the missing number in 3 4/5 divide [ ] = 2 5/7 then find the missing number. now please.

Because here you are finding an unknown, so you redo the problem.
The problem tells you to divide so the opposite is times the number
so 2 5/7 times 3 4/5 is 10 11/35

find the missing number in 3 4/5 divide [ ] = 2 5/7

Let the unknown number be x

$$\frac{3 \frac{4}{5}}{x}=2\frac{5}{7}$$

$$3\frac{4}{5}$$ can be written as $$\frac{19}{5}$$

$$2\frac{5}{7}$$ can be written as $$\frac{19}{7}$$

So equation becomes

$$\frac{\frac{19}{5}}{x}=\frac{19}{7}$$

We need to get x alone, so we multiply by x on both sides

$$\frac{19}{5}=\frac{19}{7} *x$$

Now to remove 9/7 we take reciprocal and multiply it on both sides

$$\frac{19}{5} * \frac{7}{19} =\frac{19}{7}* \frac{7}{19} *x$$

$$\frac{7}{5}=x$$

The missing number is $$\frac{7}{5}$$

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