Cyclo trip

Eighth-graders took a full-day trip on a cycling course. They took 1/7 of the route to the first break and added another 3/7 of the route to lunch. They had 18 km left to the finish. How many kilometers did the trip route measure?

Correct answer:

x =  42 km

Step-by-step explanation:

1/7 x + 3/7x + 18 =x

1/7·x + 3/7·x + 18 =x

3x = 126

x = 126/3 = 42

x = 42

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