exam Maths Puzzle Numerical Ability

a/13=2

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exam Other Question

y^2(1-2y)(2+3y) grade B syrup sells for $1.35/L less then grade A syrup.if 80L of grade B syrup is mixed with 40 L of Grade A syrup, the resulting mixture will be worth $1.85/L. what is the unit price for the two grades of syrup?