Page 117 - NUMINO Challenge_D2
P. 117
Type 13 -1 Application of Work Efficiency
It takes 20 days for Tom to finish a piece of work alone, and it takes 30
days for John to finish the work alone. After working together for 10
days, John decides to finish the remaining work alone. How long does it
take to finish the entire work?
1 Let 1 represent the total amount of work. Find the amount of work that
Tom and John each can finish in a day.
2 If Tom and John work together, what is the amount of work that they can
finish in a day?
3 What was the amount of work done by Tom and John in 10 days when
they worked together? What is the remaining amount of work?
4 How long does it take for John to finish the remaining work? How many
days does it take to finish the entire work?
114 NUMINO Challenge D2
It takes 20 days for Tom to finish a piece of work alone, and it takes 30
days for John to finish the work alone. After working together for 10
days, John decides to finish the remaining work alone. How long does it
take to finish the entire work?
1 Let 1 represent the total amount of work. Find the amount of work that
Tom and John each can finish in a day.
2 If Tom and John work together, what is the amount of work that they can
finish in a day?
3 What was the amount of work done by Tom and John in 10 days when
they worked together? What is the remaining amount of work?
4 How long does it take for John to finish the remaining work? How many
days does it take to finish the entire work?
114 NUMINO Challenge D2
