The amount saved last month by Daniel is $ 35
Solution:
Given that Daniel wants to buy a scooter that costs $129
This is $24 more than 3 times what he saved last month
Which means that $129 is equal to $24 more than 3 times what he saved last month
Let "a" be the amount which Daniel saved last month
$ 129 = $24 more than 3 times what he saved last month
129 = 24 + 3 times what he saved last month
129 = 24 + 3 (a)
Let us solve the above equation to find value of "a"
129 - 24 = 3a
3a = 105
On dividing 105 by 3 we get 35
a = 35
Thus the amount saved last month by Daniel is $ 35