Answer:
$3
Explanation:
Martin get's $8 EVERY WEEK
So, in 5 weeks, he will get:
8 * 5 = $40
He saves up all the 5 weeks, so he has all the money.
After 5 weeks, he has:
$40
Now, he decides to buy a helmet for $37. So the amount remaining is:
40 - 37 = $3
So, Martin has $3 currently