Hi there,
I'm new to the Beat the GMAT community and I'm so psyched I found this place! Already, everyone has been so helpful. I need some help with this problem. I'm not sure if there's a typo in my book, or if i just am not getting this -- this is a fairly simple ratio question.
If cement, gravel, and sand are to be mixed in the ratio of 3:5:7 respectively, and 5 tons of cement are available, how many tons of the mixture can be made?
a) 15
b) 20
c) 25
d) 30
e) 75
answer: C
Here's the book's explanation
Since the ratio of cement to gravel to sand is 3:5:7, for every 3 portions of cement we put in, we get 3+5+7 or 15 portions of mixture. Therefore the recipes gives us 15/3 or 5 times as much mixture as cement. We have 5 tons of cement available, so we can make 5x5 or 25 tons of the mixture.
This is in the Kaplan Math Workbook.
I'm new to the Beat the GMAT community and I'm so psyched I found this place! Already, everyone has been so helpful. I need some help with this problem. I'm not sure if there's a typo in my book, or if i just am not getting this -- this is a fairly simple ratio question.
If cement, gravel, and sand are to be mixed in the ratio of 3:5:7 respectively, and 5 tons of cement are available, how many tons of the mixture can be made?
a) 15
b) 20
c) 25
d) 30
e) 75
answer: C
Here's the book's explanation
Since the ratio of cement to gravel to sand is 3:5:7, for every 3 portions of cement we put in, we get 3+5+7 or 15 portions of mixture. Therefore the recipes gives us 15/3 or 5 times as much mixture as cement. We have 5 tons of cement available, so we can make 5x5 or 25 tons of the mixture.
This is in the Kaplan Math Workbook.
