exam Maths Puzzle Numerical Ability

Can you please help my son with this problem it is not in a text book
1/3x=1/2

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exam Other Question

combining like terms?

-(2x+y) - 2(-x-y)
I need help solving this problem: Please help me with this problem: How long will it take you save up $4,500 for a computer if you make deposits of $300. every 3 months into a mone