The cost of 5 pens and 2 books is Rs. 150. The cost of 7 pens and 3 books is Rs. 219. Then answer Q 43 to 45 to find the Solutions by substitution method ( Cost of one pen= x and cost of one book=y)
*According to second condition, we get __________ linear equation in two variables. *
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47) n = ______ *
48) Sn = _____ *
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