Question

A roller coaster has 3 trains with 7 rows per train. Riders stand in rows of 6, for a total of 42 riders per train. The operators of the coaster recorded the number of riders on each train during a run. On the first train, the operators reported that 6 rows were filled. On the second train, all 7 rows were filled. On the third train, 4 rows were filled. How many rows were empty on the first train? How many additional riders would it take to fill those empty rows?

Answer 1

a. 1 row

b. 6 people

Explanation:

a. Each train has 7 rows yet the first train only had 6 rows filled up. This means that:

= 7 - 6

= 1 row was empty

b. Riders stand in rows of 6 which means that one row has 6 people. With only 1 row empty, the number of people needed will be:

= 6 people