This is how i deduce ... there may be other better methods ...
😉
B.. D ... E are out cos it will not fold to become a square box ... left with A & C ....
Can use a cube/physical box/ cut out of the question to let the kid visualise why its C & not A
6 years ago
Vivian Ang
Thanks.😁
6 years ago
Soo Vei Li
Another learning point would be to eliminate those which don't have 6 sides which the square box (with a cover) will have.
Cost of one magnet is equal to 3 times the cost of postcards
6 years ago
BA Poh Ann
6 years ago
Yeo See Yeong
6 years ago
Micheal Lim
Sorry I miss out the 3 times more. Thanks
6 years ago
Micheal Lim
Asked 9 years ago
SG
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Primary 6
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Number and Algebra
I don't understand from 30 min - 420 copies onwardPls help
Replies
2
Yeo See Yeong
At 70 mins, faster machine printed 6x70=420 more and stop. Slower machine will need another 30 mins to match the same total printed by the faster machine. Therefore 30 mins print 420, 1 min print 14. Therefore 100 mins print 1400 pages. Therefore total pages printed is 1400x2 = 2800