Question 1160216
Raisin Bar,  12+N  pence
Nut Bar,  N  pence


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9 raisin bar and 12 nut bar cost £5.28. 
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{{{highlight_green(9(12+N)+12N=528)}}}

{{{9*12+9N+12N=528}}}

{{{21N+9*12=528}}}

{{{21N=528-9*12}}}

{{{N=(528-9*12)/21}}}

{{{highlight(N=20)}}}




One nut bar costs  20 pence.
One raisin bar costs 32 pence.