Q&A - P3 Math

[Sun_2010]

jessielu:

plum-cake:

[quote=\"jessielu\"]Mrs Chan bought 270 sandwiches for a party. She bought 3 times as many egg sandwiches as ham sandwiches and twice as many ham sandwiches as tuna sandwiches. How many egg sandwiches did she buy ?

Egg sanwiches =6 units.
Ham =2units,
Tuna = 1unit.
therefore 9units = 270
1uint = 270/9 = 30
so egg = 30 x 6 = 180.

How to know egg sandwiches =6 units ?[/quote] http://i50.tinypic.com/2nimfbl.jpg\">
If tuna is one unit , ham will be 2 units
If ham is 2 units then egg will be 6 units.

[jessielu]

Thanks for clarifying

[plum-cake]

jessielu:

How to know egg sandwiches =6 units ?

work backwards..
that is
\"twice as many ham sandwiches as tuna sandwiches\"
if tuna 1 unit means ham will be 2 units
\"3 times as many egg sandwiches as ham sandwiches\"
we know that ham ham is equal to 2 units so
egg will be( 2 x 3 6 units

[blushes]

Hi All


Pls assist,

Adam has 4 times as many $5 notes as $10 notes. There are a total of 35 notes.
How much money does Adam have?
thanks

[kwcllf]

blushes:

Hi All


Pls assist,

Adam has 4 times as many $5 notes as $10 notes. There are a total of 35 notes.
How much money does Adam have?
thanks

Ratio: $5 : $10 -----> 4u : 1u ----> Total = 5u

35/5 = 7 ------> 1u =7

$5 = 7x4 = 28 pieces
$10=7x1 = 7 pieces

Total amount of money = (28x$5) + (7x$10) = $210

[blushes]

Thanks, that the answer i got as well, just need to be sure.

[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