Question 1203330
h+u=400


SPEND:  available money now  {{{(2/5)h+0}}}
but money spent was  {{{(3/5)h+u}}}


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They spent $280 in all. 
How much money did Ahmad spend?
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{{{system((3/5)h+u=280,h+u=400)}}}


{{{(h+u)-((3/5)h+u)=400-280}}}

{{{(2/5)h=120}}}

{{{h=120(5/2)}}}------------Ahmed started with 300 dollars, so he spent 180 dollars.