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primary 6 | Maths
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Date Posted: 2 years ago
Views: 349
9 min
2 students → 12
1 student → 12÷2 = 6
1 min
1 student → 6÷9 = ⅔
7 students → 7× ⅔ = ¹⁴⁄₃
84 ÷ ¹⁴⁄₃ = 18 min (Ans)
2 students → 12
1 student → 12÷2 = 6
1 min
1 student → 6÷9 = ⅔
7 students → 7× ⅔ = ¹⁴⁄₃
84 ÷ ¹⁴⁄₃ = 18 min (Ans)
Thanks sa usual!
Alternative
9min 2 students → 18
9min 7 students → 7× 18÷2=42
18min 7 students → 2×42=84
Ans: 18min
9min 2 students → 18
9min 7 students → 7× 18÷2=42
18min 7 students → 2×42=84
Ans: 18min
See 1 Answer
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