alleryDouble a child's age and add 4 to get 12. How old is the child?
A8
B6
C4
D5
Answer & Solution
Correct answer: C. 4
1. Write 2x + 4 = 12, where x is the age.
2. Subtract 4 from both sides to get 2x = 8, then divide by 2 to get x = 4.
3. 8 is the value of 2x and 6 is 12 divided by 2, neither is the age.
_Source: Wikipedia, Elementary algebra, Linear equations with one variable_
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