Raina’s sister is 3 times as old as she is. If R represents Raina’s age now, which of the following expressions represents her sister’s age in 2 years?
The problem gives us that "Raina's sister is 3 times as old as she is." This means that if R is Raina's age, her sister's age will be 3R (three times Raina's age).
Then, the question asks for "her sister's age in 2 years." To calculate someone's age in 2 years, we simply add 2 to their current age.
So, if her sister's current age is 3R, her age in 2 years will be 3R + 2.
Therefore, the expression representing the sister's age in two years is 3R + 2.
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