exam Maths Puzzle Numerical Ability

6a + 3+ 2a = 11

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exam Other Question

What are the steps for solving this problem:

Solve the linear system of equations-

3x + 7y = 15
-5x + 2y = 16
Could I ask your help?

Lamps which cost $120 wholesale are sold for $192, at a profit of $6 per lamp. How many lamps were in the shipment?
9
10
11
12
13