Adrian Ng
Asked 9 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

Making it visual...

Replies 2
Shahul Hamid

Very clear explanation and organised. 4 marks out of 4.

6 years ago
Kamalshamsul Adnan

Thxs :)

6 years ago

Jia Ying Sin
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

P5 ques pls

Replies 2
Soo Vei Li

Would you like to try first and post your solutions here for feedback?

6 years ago
Raymond Ng

6 years ago

Vanitha Guna
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

p5 problem. need help. thanks

Replies 6
Vera Koh

6 years ago
Vera Koh

6 years ago
Zhong Shu Hao

lemme check again... :o

6 years ago
Zhong Shu Hao

Ooops careless :P

6 years ago
Vanitha Guna

thanks

6 years ago
Zhong Shu Hao

G&C...

6 years ago

Vanitha Guna
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

p5 problem. need help. Is the answer 12 or 30?

Replies 5
Hong Keng Kor

Initially 30% are swordtails, ie 36 are swordtails. When some guppies died, the 36 swordtails remain alive. Hence 36 swordtails makes up 40% of the fish now. Hence, there are 90 fish remaining. So 30 guppies died

6 years ago
Shahul Hamid

Yep. no. of swordtails remain the same so use that to solve the problem.

6 years ago
Koh Lay Koon

6 years ago
Cauvery Alagappan

120/100*30=36 36/40=0.9 0.9*60=54

6 years ago
Cauvery Alagappan

Last step is 120/100*70=84 84-54=30

6 years ago

Vanitha Guna
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

p5 problem.need help.thanks

Replies 5
Raymond Ng

Shortcut method: (4x6) รท (4+6) = 2.4 min = 2min 24sec

6 years ago
Vera Koh

hope this is helpful..

6 years ago
Vanitha Guna

Thanks

6 years ago
Vanitha Guna

can you please explain the short cut method Raymond Ng

6 years ago
Raymond Ng

Sorry. Was having lessons. JCs midyr coming soon. OK, that was the shortcut trick. If you prefer to visualise or think step by step, then just follow the other nice solutions provided by the helpers in this forum. Or, you may simply apply the Work Done Eqn: 1/T = 1/A + 1/B So T = 1/ ( 1/A + 1/B) = AB/(A+B) Hope this clarifies

6 years ago

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