1.

Cost of two pencils and three earasers is rs 18, while the cody of one pencil and two erasers is rs 11. the cost of each pencil is

Answer» LET the COST of each PENCIL be x.
Let the cost of each ERASER be y.
2x+3y=18
2x=18-3y
x=18-3y/2

x+2y=11
18-3y/2+2y=11
18-3y+4y/2=11
18-3y+4y=11×2
18+y=22
y=22-18
y=4

2x+3y=18
2x+3×4=18
2x+12=18
2x=18-12
2x=6
x=6/2
x=3


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