Problema Solution
Question 16
Mary is 3 times older than her brother Alex. After five years, she will be twice of his age. Find their present ages.
Answer
A) 4, 12
B) 5, 15
C) 3, 9
D) 6, 18
A) Approx 66138 lb
B) Approx 33069 lb
C) Approx 2578 lb
D) Approx 7128 lb
Answer provided by our tutors
Question 16
Mary is 3 times older than her brother Alex. After five years, she will be twice of his age. Find their present ages.
Answer
A) 4, 12
B) 5, 15
C) 3, 9
D) 6, 18
Solution:
Mary: 3x years old
Alex: x years old
The equation is
3x + 5 = 2(x+5)
x = 5
So their present age is 5,15
We choose (B)