Cost of 4 pens, 6 note books and 9 files is Rs 305. Cost of 3 pens, 4 notebooks and 2 files is Rs 145. What is the cost (in Rs) of 5 pens, 8 notebooks and 16 files?
let the cost of pen be 'p',note book be 'n' and of file be 'f'
given 4p+6n+9f=305
8p+12n+18f=610
3p+4n+2f=145
Subtracting we get
5p+8n+16f=465
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