book Maths Puzzle Numerical Ability

Sally wants to buy some things for her hair. She can buy 2 scrunchies & 4 barretts for $12.50 or 1 scrunchie & 6 Barretts for $12.25. How much does the scrunchie cost theat she wants to buy?
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book Other Question
John, twelve years old, is three times as old as his brother. How old will John be when he is twice as old as his brother? what is the equasion of the line parallel to y=4x-3 through the point (-1, 2)