Karley is twice as old as Lana. Three years from now, the sum of their ages will be 42. How old is Karley?© BrainMass Inc. brainmass.com October 9, 2019, 3:46 pm ad1c9bdddf
Karley is twice as old as Lana. Three years from now, the sum of their ages will be 42. How old is Karley?
We can solve this problem using either one or two variables:
1. One-variable solution:
We'll let Lana's age be x. We can set up a chart:
in 3 years:
Karley 2x + 3
Lana x + 3
The sum of their ages in 3 years will be 42, so we have:
(2x + 3) + (x + 3) = 42
3x + 6 = 42
3x = 36
x = 12
If Lana is 12, Karley is 24; in three years they will be 15 and 27, and the sum of their ages will be 42.
2. Two-variable solution:
If we want to use two variables to express the given information, we will need two equations to solve for these ...
In a step-by-step process, this solution assists in solving algebraic problem using one or two variables: How old is Karley?