SG
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Primary 6
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Number and Algebra
Anybody can help? Thanks.
Replies
8
Caleb Tey
152+324 cannot divide by 3.
6 years ago
Soo Vei Li
This should help you start... (Error in the working below -- yellow in the end is 53 + 59 = 112, Yellow at first = 152 + 112 = 264)
6 years ago
Caleb Tey
But they had the same number of each colour
6 years ago
Soo Vei Li
What I have drawn is the 'after' model. Referring to your earlier comment, I think you misread the question -- 152 given away is only for the yellow beads. Now we know there were 254 yellow, red and purple beads at first, we can work out how many red beads were given away.
6 years ago
Caleb Tey
Ok
6 years ago
Pauline Vong Nyit Li
Is this working and answer correct ?
6 years ago
Soo Vei Li
Yes, Pauline Vong Nyit Li, your solution is correct :)
6 years ago
Carrie Ong
Thanks, Caleb Tey, Vei Li Soo and Pauline Vong Nyit Li.
6 years ago
Serina Goh
Asked 9 years ago
SG
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Primary 5
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Number and Algebra
Can someone enlighten me why the answer is 44min pls? 😳
Replies
8
Zhong Shu Hao
by what you are doing, u mean that to leave the rope as it is, you need 3 minutes, which does not make sense.
6 years ago
Zhong Shu Hao
think about what you do when cutting the rope into 4 pieces. What exactly is the ACTION that takes up the time?
6 years ago
Raymond Ng
6 years ago
Jason Oon
No. of Cuts = No. of Pieces - 1
Hence cuts for 4 pieces = 4 - 1 = 3 cuts
3 cuts = 12 minutes
1 cut = 4 minutes
Cuts for 12 pieces = 12 - 1 = 11 cuts
11 x 4 minutes = 44 minutes
6 years ago
Soo Vei Li
Serina Goh, when we do 12/4, it's like we are carrying out 4 tasks (e.g. making 4 ropes), but in cutting to get 4 pieces, we only need to make 3 cuts, so, 4 min/cut. To get 12 pieces, we need only 11 cuts, so 44 minutes.