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Irene Ong

Asked 9 years ago

SG Primary 5 Number and Algebra

Replies 0

Irene Ong

Asked 9 years ago

SG Primary 5 Number and Algebra

Replies 1

Kai Meng

"3/5" suggests that the total number of children is a multiple of 5, so change the initial ratio to 15:20. 1/4 of the 20u of girls left, so 15u remained. 3/5 of the total 35u remained, which is 21u, so 6u of boys remained, and 9u of boys left.

6 years ago

Aaron Hee

Asked 9 years ago

SG Primary 6 Number and Algebra

Can someone suggest an alternative solution to this P6 question other than using G&C？

Replies 6

Zhong Shu Hao

suppose all packets bought are flour.the total mass would be 150kg. The diff would thus be 150kg-0kg＝150kg. For every packet sugar instead of flour, the difference increases by 2.5kg+2kg＝4.5kg. So the number of sugar is (150kg-42kg)/4.5kg＝24.

6 years ago

Zhong Shu Hao

2.5kg comes from 1less packet of flour,2kg comes from one packet of sugar.

6 years ago

Zhong Shu Hao

6 years ago

Zhong Shu Hao

another Q that uses the same approach is the student participates in game Q.

6 years ago

Zhong Shu Hao

E.g. a student participates a game contest and answers 50questions. For every correct question answered, he scores 3 points. For every question answered wrongly, 2 marks will be deducted. Given that the student answered all questions and scored a total of 60 points, findthe number of questions correctly answered.

6 years ago

Aaron Hee

So I see that it's another way of looking at the supposition method ... Tks a lot appreciate it

6 years ago

Adrian Ng

Asked 9 years ago

SG Primary 5 Fractions

Making it visual...

Replies 0

Serene Koon

Asked 9 years ago

SG Primary 5 Fractions

Appreciate. .

Replies 5

Aishwarya Karthik

Thanks for the easy solution

6 years ago

Yueh Mei Liu

Steps were correct where it was done until.

6 years ago

Yueh Mei Liu

6 years ago

Serene Koon

My boy get stuck halfway. Thanks Yueh Mei

6 years ago

Lucie Ng

6 years ago

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