The minimum value of (1) divisor is 53, and the minimum value of dividend is 53*86+52=46 10.

(2) I don't study equations in primary school, so I suggest you do. I don't know if you can understand.

Suppose 20 frogs eat 20 * * 25 * * 500 pests every day.

Every toad eats more than frogs a day 10.

The current situation is that 620 pests are eaten every day, so some toads eat more 120 every day.

So 120/ 10= 12.

So there are 12 toads and 8 frogs.