book Maths Puzzle Numerical Ability

7g-15=-3g+175

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A retired couple had up to $50,000 to place in fixed-income securities. Their financial adviser suggests two securities to them: one is an AAA bond that yields 8% per annum; the o A bank teller gave a customer $300. She gave twice as many fives as tens, and half as many twenties as tens. How many of each bill did she give the customer?