The cost of 40 pens and 70 pencils is 1715 what is the cost of 16 pens and 28 pencils
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let cost of pen be X and pencil be y
40x+70y=1715......(1)
16x+28y=a.......(2)
solving (1)*16 and (2)*40, we get
640x+1120y=27440
640x+1120y=40a
by subtracting we get
27440-40a=0
27440=40a
=>a=686
40x+70y=1715......(1)
16x+28y=a.......(2)
solving (1)*16 and (2)*40, we get
640x+1120y=27440
640x+1120y=40a
by subtracting we get
27440-40a=0
27440=40a
=>a=686
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