Machine G takes 8 minutes to cut 128 pieces of lumbers. Machine H takes 17 minutes to cut 153 pieces of lumbers. Machine J takes 7 minutes to cut 84 pieces of lumber.
- Which is the faster combination, G and H or H and J? (Eg A, B)
- In 1 minute, how many more pieces of lumbers can be cut by the faster combination compared to the other combination?
(a)
Time taken by Machine G alone:
8 min → 128 pieces
1 min → 128 ÷ 8 = 16 pieces
Time taken by Machine H alone:
17 min → 153 pieces
1 min → 153 ÷ 17 = 9 pieces
Time taken by Machine J alone:
7 min → 153 pieces
1 min → 84 ÷ 7 = 12 pieces
Time taken by Machine G and Machine H together:
1 min → 16 + 9 = 25 pieces
Time taken by Machine H and Machine J together:
1 min → 9 + 12 = 21 pieces
Machine G and H are the faster combination.
(b)
Number of more pieces of lumbers that can be cut by the faster combination (Machine G and H) in 1 minute
= 25 - 21
= 4
Answer(s): (a) G, H or H, G; (b) 4