Math Problem of the Week - Upper Elementary - Dec. 5, 2021 to Dec. 11, 2021

Upper Elementary: 

Question: Eight studets are performing songs for their music class recital. Each song is 5 minutes long. If each music student performs 1 song and all 8 students must be done performing by 9:15 PM, then what is the latest time they can start the recital?

Answer:  The latest they can start is 8:35 pm.

Solution:  The amount of time it takes for all of the students to finish their songs is 8 × 5 = 40 minutes. Since they have to finish the recital by 9:15 pm, we count back 40 minutes before 9:15 pm to 8:35 pm.