Question 675341
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Hi
He spends £10 on a meal and then one-quarter of what he has left on a taxi home. 
He now has half of what the {{{highlight(x)}}}he started with.
Best to Set it Up Algebraically:
  {{{x - 10 - (1/4)(x-10) = (1/2)x}}}  |Multiplying thru by 4 so as all denominators = 1
    4x-40 - (x-10) = 2x
            x = £30, amount he started with
and...
£30 - £10  - £5 = £15