exam Maths Puzzle Numerical Ability

Whats 60 kilometers in 1.5 hours average speed?

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exam Other Question

Dylan sells $1,000 ads for the radio station he works for. He earns $566 per week, plus four percent commission. In the last six weeks, Dylan earned $6,516. How many ads did he sell? Can someone help me on this problem?

I need t solve the system by addition:

x + y = 6
x - y = 4

Thank you,
Lisa