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Marla is 20 years older than Angelina. In 5 years, Marla will be 3 times as old as Angelina. What will Marla’s age be in 3 years?
  • a)
    38
  • b)
    33
  • c)
    28
  • d)
    25
  • e)
    23
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Marla is 20 years older than Angelina. In 5 years, Marla will be 3 tim...
First, let’s define our two variables:
M = Marla’s age today
A = Angelina’s age today
Next, we can write two equations from the information presented in the problem stem.
Since Marla is 20 years older than Angelina, we have:
M = A + 20 (equation 1)
Since in 5 years, Marla will be 3 times as old as Angelina, we have:
M + 5 = 3(A + 5)
M + 5 = 3A + 15
M = 3A + 10 (equation 2)
Next, from equation 1, we can substitute A + 20 for M in equation 2, and then solve for A:
A + 20 = 3A + 10
10 = 2A
5 = A
Finally, we see that Angelina is 5 years old. Thus, Marla is currently 5 + 20 = 25 years old. So, in 3 years, Marla will be 28 years old.
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