A parent is 5 times as old as their child. Together they are 36. How old is each?
The child is 6 and the parent is 30.
How to work it out
- 1
Let x be the child's age. The parent is 5 times as old, so the parent is 5x.
- 2
Together they are 36:
- 3
Combine the x terms and divide:
- 4
The parent is 5 × 6 = 30.
- 5
Check: 6 + 30 = 36 ✓ and 30 = 5 × 6 ✓.
LaTeX source of the formulas on this page
\[ x + 5x = 36\ \Rightarrow\ x = 6 \]
\[ x + 5x = 36 \]
\[ 6x = 36\ \Rightarrow\ x = \frac{36}{6} = 6 \]Questions
How old is the child?
6.
How old is the parent?
30.