The combined price of 1 pen and 3 copies is Rs 210. The combined price of 3 pen and 5 copies of same quality id Rs 430. What is the combined price of a copy and Pen?
Ans : Rs 110
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let the price of pen = x
and price of copy = y
x+3y=210 (1)...
3x+5y=430 (2)...
multiple (1) by 3 and subtract from (2)..eq
3x+5y=430
-3x-9y=-630
-4y =-200
4y =200
y=50 and put value of y in(1)..eq
x=60
x+y =110
and price of copy = y
x+3y=210 (1)...
3x+5y=430 (2)...
multiple (1) by 3 and subtract from (2)..eq
3x+5y=430
-3x-9y=-630
-4y =-200
4y =200
y=50 and put value of y in(1)..eq
x=60
x+y =110
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