exam Maths Puzzle Numerical Ability

Please help.

Please Solve the system by graphing

3x + y = 6
3x - y = 0

Thanks
JMS

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exam Other Question

One pipe can fill a tank in 24 minutes. A second pipe can fill it in 8 minutes and a third pipe can fill it in 12 minutes. If the tank is empty, how long will the three pipes operating together take to fill it?

____minutes

**THANKS** Find for consecutive integers such that the sum of the second and the fourth is 17 less than thrice the first.