exam Maths Puzzle Numerical Ability

when the first of two numbers is added to twice the second number, the result is 21, but when the second number is added to twice the first the result is 18. find the two nummbers.

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exam Other Question
(3)A 100% concetrate is to be mixed with a mixture having a concentrate of 40% to obtain 55 gallons of a mixture with a concentrate of 75%. how much of the 100% concentrate will be needed?
 Factor:

x^2+7x+6