Can you show the pairs of variables?
Answer:
10
Explanation:
Make our unknown equal to x, in this case his current age.
In 20 years he will be three times as old as he is now, in other words:
x + 20 = 3x
Now solve the equation:
20 = 3x - x
20 = 2x
10 = x
He only made $10. Considering the horse was sold for $90.
Answer:
450
Step-by-step explanation:
