Answer: 4 coins
Spencer scored 75 points by collecting three coins
Firstly, we need to know the number of points that give one coin
Since, 75 points give 3 coins
One coin = 75 / 3
one coin = 25 points
So, for every one coin Spencer will need a 25 points
If a coin generate 25 points, how many coins will 100 points give
1 coin = 25 points
x coins = 100 points
Cross multiply
25 * x = 100 x 1
25x = 100
Divide both sides by 25
25x/25 = 100/25
x = 4 coins
Spencer would collect a total of 4 coins to score a total of 100 points