Another maths question (sum and difference)
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Another maths question (sum and difference)
Hi need help with this question.
Can someone tell a technique for such sort of questions.
The total of 2 amounts is £12 and their difference is £3.60.Find the 2 amounts.
Can someone tell a technique for such sort of questions.
The total of 2 amounts is £12 and their difference is £3.60.Find the 2 amounts.
Re: Another maths Question
Good evening,
You would need to substract £3.60 from £12 - which leaves you with £8.40
Then divide £8.40 by 2 = £4.20
One of the amount is £4.20
The other amount is £4.20 + £3.60 = £7.80
You would need to substract £3.60 from £12 - which leaves you with £8.40
Then divide £8.40 by 2 = £4.20
One of the amount is £4.20
The other amount is £4.20 + £3.60 = £7.80
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parent2013
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Re: Another maths Question
Option 1: Hit n trial
Pros - you will get the answer eventually
Cons - it may take lot of tries and may eat up precious time
Option 2: Algebra (my recommendation)
Pros - you will get the answer in couple of steps for even complicated equations
Cons - you need to be versed with simultaneous equations
x + y = 12
x - y = 3.60 (do addition of equations)
-------------------
2x + 0 = 15.60
x = 15.60/2 = 7.80
y = 12-7.80 =4.20
FYI - this is a very simple scenario. I have seen examples in private papers where one has to multiply equation 1 by a number and equation 2 by another number before solving.
Pros - you will get the answer eventually
Cons - it may take lot of tries and may eat up precious time
Option 2: Algebra (my recommendation)
Pros - you will get the answer in couple of steps for even complicated equations
Cons - you need to be versed with simultaneous equations
x + y = 12
x - y = 3.60 (do addition of equations)
-------------------
2x + 0 = 15.60
x = 15.60/2 = 7.80
y = 12-7.80 =4.20
FYI - this is a very simple scenario. I have seen examples in private papers where one has to multiply equation 1 by a number and equation 2 by another number before solving.