if 11 pens and 19 pencils together cost 502 rupees while 19 pens and 11 pencils together cost 758 rupees how much 3 pens and 86 pencils together cost
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ATQ. 11x+19y =502.
19x + 11y = 758
find x. and y
and put value in 3x & 86y
19x + 11y = 758
find x. and y
and put value in 3x & 86y
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