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x = pens she sold
45 = pencils she sold
now
if she sold 45 pencils so according to question she would get 45 rupees as profit but she is getting loss of 5 rupees then
profit of pencils+ loss of pens = loss in total
45 + loss of pens = -5
loss of pens = -50
loss of pens = loss of 1 pen x total number of pens
-50 = -4 paise x total number of pens
1 Paisa = 1 / 100 rupee
40 Paisa = 1/2.5 Paisa
so -50/-1/2.5 = total number of pens
total no. of pens= 125
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