Question
Cost of 4 books and 5 pens is 32 and cost of 5 books and 4 pens is 31 then find the cost of 1 book B=?
Answers
anon
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PsyDAG
4b + 5p = 32
5b + 4p = 31
Multiply first equation by 4 and second by 5.
16b + 20p = 128
25b + 20p = 155
Subtract first from second and solve for b.
5b + 4p = 31
Multiply first equation by 4 and second by 5.
16b + 20p = 128
25b + 20p = 155
Subtract first from second and solve for b.