The cost of 3 bananas 4 apples and 6 mangoes is rs.29 and the cost of 2 bananas 6 apples and 3 mangoes is rs.23.what is the cost of 7 bananas 16 apples and 12 mangoes???

Answer 1

3b+4a+6m = 29
2b+6a+3m = 23

multiply the 2nd equation by 2, then add the two equations.

Answer 2

Thank for it

Answer 3

Why we multiply 2 with second equation