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    • Thread Starter

    "Simon can buy 3 pencils and have 49p change or he can buy five pencils and have 15p change.

    Write this information as an equation for x, cost in pence for one pencil"

    Okay so, 3x + 49 and 5x +15...... it's + of course cause you're getting money back. But to get the cost of one pencil you equate it......

    3x + 49 = 5x + 15 and cost for one would be 17p wouldn't it?? Then it asks how much money does Simon have to start with. How would i figure that out????

    Thanks in advance.

    edit - wouldn't you just add 17p to the change you are given, so wouldn't it be 98p?????


    He has (3x+49)p to start with, how much is that (given what x is...)

    Just solve it simultaneously, your basically there already.

    3x + 49 = 5x +15

    So, 49 = 2x + 15, 2x = 34, x = 17

    Sorry, and money to start with will just be the 3x + 49, so 3(17) + 49 which = 100
    • Thread Starter

    oh yesss, so just sub in x instead of adding it to the change given to get the money he started with which is £1..... thanks guys!!
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