3.3 Application of Linear Equations

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A boy is 4 times as old as his sister. In 6 years, the sum of their ages will be 50. How old is the boy now?

(x+6) + (4x+6) = 50 Boy = 32

The sum of three consecutive even numbers is 54. What are the numbers?

16, 18, 20

A girl walks 3 km/h for 40 minutes and then runs for 20 minutes. If she travelled 5 km total, what was her running speed?

3. Walk: 3×(40/60)=2 km; run distance = 3 km r × (20/60) = 3 → r=9 km/h → 9 km/h

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