Q&A - P3 Math

[cindyll]

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

[SAHM Chew]

cindyll:

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

The q is not clear, is it asking for A before cutting or after cutting? Before cutting, A is 12cm, after cutting, A is 9cm

[Funz]

cindyll:

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

I got 9cm. Cannot be 13cm. If 13cm the total length for the ribbons will be more than 30.

[cindyll]

SAHM Chew:

cindyll:

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

The q is not clear, is it asking for A before cutting or after cutting? Before cutting, A is 12cm, after cutting, A is 9cm

Thank you SAHM Chew

[cindyll]

Funz:

cindyll:

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

I got 9cm. Cannot be 13cm. If 13cm the total length for the ribbons will be more than 30.

Thanks Funz. Will have to go back to school this Friday to confirm with the teacher.

[Sun_2010]

cindyll:

Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

initial lenght of A cannot be 13 cm.

9 is the only correct answer

[Funz]

cindyll:

Funz:

[quote=\"cindyll\"]Hi Parents


Appreciate your help on P3B text book question.

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?

I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

I got 9cm. Cannot be 13cm. If 13cm the total length for the ribbons will be more than 30.

Thanks Funz. Will have to go back to school this Friday to confirm with the teacher.[/quote]
Ok now I see where the confusion is. If the question is interpreted as after 3cm is cut from A the total length is 30, and that the question is asking for the length of A at the beginning, the answer would be 13cm.

[Nebbermind]

Shouldn't the answer be 9cm? Mrs Sim already cut A (the qn did not say 'If Mrs Sim...').


BTW, the length before cutting is 12cm, not 13cm. 12 cm + 18cm = 30cm.

[cindyll]

Nebbermind:

Shouldn't the answer be 9cm? Mrs Sim already cut A (the qn did not say 'If Mrs Sim...').


BTW, the length before cutting is 12cm, not 13cm. 12 cm + 18cm = 30cm.

Thanks Nebbermind. Guess the answer now is either 9 or 12. Will have to ask the math teacher this Friday.

Will let you guys know the correct answer.

[qms]

cindyll:

Total length of ribbon A & B is 30cm. Mrs Sim cut 3cm from ribbon A. In the end, ribbon B is twice as long as ribbon A. What is the length of ribbon A?


I got 2 possible answers, 9 and 13. May I know which one is correct?

Thank you very much for assisting.

Funz:

Ok now I see where the confusion is. If the question is interpreted as after 3cm is cut from A the total length is 30, and that the question is asking for the length of A at the beginning, the answer would be 13cm.

The question started by stating that the length of the ribbon A & B is 30 cm. Thereafter, Mrs Sim cut out 3 cm. Hence, it should not be the case that 30 cm refers to the length after Mrs Sim cut out 3 cm.