Hello there. To solve this question, we'll need to set an easy equation to find how many of each golf ball Paul haves on his bag.
Say the amount of yellow golf balls in his bag is x. It means, according to the question, that he haves 4 times as many white golf balls, such that he haves 4x white golf balls.
The total amount of golf balls he'll have on his bag is x + 4x = 5x.
Now, we know that he haves forty balls in his bag that are either white or yellow.
Making those values equal, we'll get:
5x = 40
Divide both sides of the equation by a factor of 5
x = 8
Paul haves 8 yellow golf balls.
Multiplying both sides by a factor of 4, we'll get the amount of white balls Paul haves:
4*8 = 32.
Paul haves 32 white golf balls on his bag.