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One number is (8) more than another. The sum of three times one and twice the other is (94). What is the smaller number?

Answer and explanation

Correct answer: (14)

Word problems become easier when the unknown quantities are represented by variables. Since one number is 8 greater than the other, the larger number can be written as the smaller number plus 8. The statement about three times one number and twice the other gives a second equation. Substituting the first relationship into that equation reduces the problem to one variable. The wording is consistent with taking the coefficient 3 for the larger number, as used in the supplied solution.

Let the smaller number be 
m y
m. Then the larger number is 
m x=y+8
m. The condition gives 
m 3x+2y=94
m. Substitute: 
m 3(y+8)+2y=94
m, so 
m 3y+24+2y=94
m and 
m 5y=70
m. Hence 
m y=14
m. The larger number is 22, and 
m 3(22)+2(14)=94
m, so option B is correct.

Related tags

Word-ProblemNumbersSubstitution

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