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# help plzzzzzzzz gcse maths Watch

1. alex spent 2/7 of his pocket money on computer games.he spent 1/4 of his pockets money on sweets. he saved the rest. given that alex saved £3.90, work out how much pocket money he got.

right this is the question and i cant work out how to get £8.40 ... please help meeeeeeeeeeeeeeeeee
2. (Original post by moniasajid)
alex spent 2/7 of his pocket money on computer games.he spent 1/4 of his pockets money on sweets. he saved the rest. given that alex saved £3.90, work out how much pocket money he got.

right this is the question and i cant work out how to get £8.40 ... please help meeeeeeeeeeeeeeeeee
Take x to be the amount of pocket money he had originally and form an equation
3. First off, find a common denominator for 2/7 and 1/4. It is 28.
7*4=28, so do the same to the numerator. 2*4=8. So now your 2/7 has become 8/28.
Now do the same for the second fraction. 4*7=28. So, 1*7=7. So that fraction has become 7/28.
8/28+7/28= 15/28. That's how much pocket money he spent overall.
So the amount left over would be 13/28, as a fraction.
We know 13/28 is £3.90, because it's been given. Now divide £3.90 by 13= 30p. So, 1/28= 30p.
Now multiply 30p by the denominator, 28 to get 30*28= 840.
Put that into the right format and you get £8.40!

~We live in an age of smart phones and stupid people.
4. (Original post by Meliss)
First off, find a common denominator for 2/7 and 1/4. It is 28.
7*4=28, so do the same to the numerator. 2*4=8. So now your 2/7 has become 8/28.
Now do the same for the second fraction. 4*7=28. So, 1*7=7. So that fraction has become 7/28.
8/28+7/28= 15/28. That's how much pocket money he spent overall.
So the amount left over would be 13/28, as a fraction.
We know 13/28 is £3.90, because it's been given. Now divide £3.90 by 13= 30p. So, 1/28= 30p.
Now multiply 30p by the denominator, 28 to get 30*28= 840.
Put that into the right format and you get £8.40!

~We live in an age of smart phones and stupid people.
aw thank you so much ......
5. (Original post by moniasajid)
aw thank you so much ......

Anything else you need help with?

~We live in an age of smart phones and stupid people.

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