Problema Solution
Alex and David have 350 baseball cards in all. Alex has 60% o the cards. What is the difference in the numbers of the cards the boys have?
Answer provided by our tutors
Alex has 60% of 350 or: 0.60*350 = 210 cards
David has: 350 - 210 = 140 cards
The difference in the number of cards is: 210 - 140 = 70 cards.
Another way to solve this problem is the following:
Alex has 60% of the cards thus David is left with 100 - 60 = %40 of the cards.
The difference in the number of cards is 60 - 40 = 20% of 350 cards or 0.20*350 = 70 cards.