A group of cyclists went bike riding during a 7-day vacation. They biked 131 miles in the first three days. By the end of their vacation, they had biked 287 miles in all. How many miles did they bike during each of the last 4 days if they biked the same distance each day?

Answer: 156 miles

Step-by-step explanation:

Given, A group of cyclists went bike riding during a 7-day vacation.

Total distance they biked in first three days = 131 miles

Total distance they biked by the end of the vacation (i. e. in 7 days) = 287 miles

Then, the total distance they biked in last four days would be=

(Total distance they biked in 7 days) - (Total distance they biked in first 3 days)

= 287 - 131 miles

= 156 miles

Hence, they biked 156 miles in last 4 days.