book Maths Puzzle Numerical Ability

Delia and Dweezel each receive $50. Delia spends $2 each week, and Dweezel spends $5. When will Delia have twice as much money as Dweezel?

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______ I am having troubles with my homework on problem solving such as 16- J= 12, what is the value of J? Our teacher taught us to make a positive 16 which crosses out the other 16 but