Question

Book B is $15 three times more than book A. Book A and B together is $75. What is the cost of book A?

Need to solve in simultaneous equations

Answer 1

Step-by-step explanation:

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Answer 2

B = 3A + 15

A+ B = 75

substritute values of B in second eqn

A + 3A + 15 = 75

4A = 75 -15

A = 60/4

A = $15