exam Maths Puzzle Numerical Ability

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d(d-3)=40

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exam Other Question

Martina went shopping. She spent one-fifth of what she had in her wallet and then one-fifth of what remained. In all she spent $36. How much did she start with?

Can you help me with this problem?

Thank you! Solve each system by the addition method:

x/3 - y/2 = -5/6

x/5 - y/3 = -3/5