book Maths Puzzle Numerical Ability

A 100% concentrate is to be mixed with having a concentration of 40% to obtain 55 gallons of a mixture with a concentration of 75%. How much of the 100% concentrate will be needed?

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book Other Question
3x+y=14
2x-y=6 Express the statement in terms of an inequality involving an absolute value. The radius r of a ball bearing must be within 0.01 cm. of 1 cm.