Can you explain how to solve this math problem: Jamaar loves fresh fruit and is headed to the store with $10 he earned mowing lawns. Including tax, peaches and pears are $.5 each, apples are $.75 each, kiwis are $1, and plums cost $.25 each. If he has already purchased 3 peaches, 4 pears, 2 kiwis, and 5 apples, how many plums can he buy?
He has spent $3.5 on peaches and pears because 7 x .5 = 3.5
He has spent $2 on kiwis because 2 x 1 = 2
He has spent $3.75 on apples because 5 x .75 = 3.75
He has already spent $9.25 because 3.5 + 2 + 3.75 = 9.25
He can buy three plums because .75 / .25 = 3