simplest way to approach the questionWatch
A frog is at the bottom of a well. It makes leaps of 30cm and slips back 20cm each time. If the well is 5m deep, after how many leaps will it jump out of the well
I got that by saying that the total progression the frog makes each leap is 10 cm and 10/500cm =50
Assuming the frog doesn't tire. and the slippage remains constant.
Because after 47 leaps the frog will have gained 4.7 metres. And on the 48th leap would get to 5 metres. or 5 metres and a bit due to the height of the frog and depending how the 30cm leap measuerment is defined.