What do I do when met with a typical question such as
Mr Harris had a party, he bought some bottles of lemonade costing 75p each and some bottles of orange juice costing 82p each. Altogether he spent £71.94. How many bottles of orange juice did he buy?
I know the trial and error method, but I hate, hate, hate that method with a passion, so I was wondering if I can do it another way, say, using algebra?
Maths Help Please? Thank You Watch
- Thread Starter
- 09-04-2013 16:48
- 09-04-2013 17:27
Let qty orange = g
Let qty lemon.. = n
We know g+n= 75+82 = 157
75n + 82g = 7194
So if g+n = 157 then n = 157-g
Substitute n into bigger eq,
75(157-g) + 82g = 7194
Then solve for g with algebraic manipulation.
Then substitute g again into 75n + 82g = 7194 to get n.