In the question, we are told that Graham borrowed $10 from his mum to buy a toy. He pays back his mum $2 per week from his allowance. We can find how long will it take for him to pay her below.
Step-by-step explanation
Since Graham is paying back every week, this means that the payback time would be measured in weeks.
We can use the formula below;
Thus;
Answer: 5 weeks