Hi guys,
I have this question that has always bugged me and I never quite sussed the method my book was explaining. I got an A at GCSE an I am well into at A-level now, so I thought I would go back and look at it, but it is still getting me. It's a question on ratio and proportion. My algebra is good, so I thought I would look at it with algebra in mind, but I can't get very far with it.
This is an example of a very basic question where I would use algebra. The question goes as follows; 10 boys plan a camp and have sufficient food for 14 days. If 3 boys are ill and cannot go, how long will the food now last?
So I use this method:
10 = k/14
k= 140
7 = 140/y,
7y = 140
y = 140/7 = 20
Now the question I am asking about is a bit bigger.
8 pumps working for 10 minutes raise 440 litres of water. How long will it take 6 pumps to raise 396 litres of water?
I know the answer, but can someone help me with an algebraic method to solve this, please?
Thanks in advance!