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Maths Puzzle
Numerical Ability
If twice a certian number is increased by 3, the result is 8 less than threes time a number. Find the number
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how do solve by graphing: x+y=-1
3x-y=-7
John leaves his house at 7:30am. His sister,Mary leaves at 8:30am and tries to catch up with John. She is walking 2 km/h faster than him on the same route in the same direction.