Q&A - P3 Math

[oscarsem]

CNS:

ozora:

Need help . Besides guess n check method, any other alt method for the following question. I have less than 270 marbles. The marbles can be kept equally in either 6 or 7 containers without remainder. What is the max. No of marbles I have?

Ans is 210. Goes by 7 times table.

the answer is 252. no 210 if u goes by the guess and check

[ozora]

oscarsem:

CNS:

[quote=\"ozora\"]Need help . Besides guess n check method, any other alt method for the following question. I have less than 270 marbles. The marbles can be kept equally in either 6 or 7 containers without remainder. What is the max. No of marbles I have?

Ans is 210. Goes by 7 times table.

the answer is 252. no 210 if u goes by the guess and check[/quote]thanks oscar. the answer is 252.
any other alternative method?

[chloecube]

Thank MathIzzzFun

that is a very good solution

[chloecube]

need help:


Joyce & Anne had S$3000.00 altogether.
Joyce gave S$650.00 to Anne and Anne had 2 times as much as Joyce.
How much does Joyce have at first?

[MathIzzzFun]

chloecube:

need help:


Joyce & Anne had S$3000.00 altogether.
Joyce gave S$650.00 to Anne and Anne had 2 times as much as Joyce.
How much does Joyce have at first?

Hi

You may want to give it a shot, taking note that :
- total amount both had remained the same after the transfer
- in the end, Anne had twice as much as Joyce ie total 3 units

cheers.

[chloecube]

MathIzzzFun:

chloecube:

need help:


Joyce & Anne had S$3000.00 altogether.
Joyce gave S$650.00 to Anne and Anne had 2 times as much as Joyce.
How much does Joyce have at first?

Hi

You may want to give it a shot, taking note that :
- total amount both had remained the same after the transfer
- in the end, Anne had twice as much as Joyce ie total 3 units

cheers.

is the answer 1350?

but i am not too good in using model to explain to DS

[24hr-mum]

given that total remains 3000 even after the transfer, and that after the transfer anne is 2 times and joyce is 1 times , ie total 3 times (or 3 units), so 1 unit is 3000/3, ie $1000, so before the transfer Joyce shd hv $1000+$650 (amt transferred)=$1650. is that correct???


it can be solved by logic without models

[MathIzzzFun]

24hr-mum:

given that total remains 3000 even after the transfer, and that after the transfer anne is 2 times and joyce is 1 times , ie total 3 times (or 3 units), so 1 unit is 3000/3, ie $1000, so before the transfer Joyce shd hv $1000+$650 (amt transferred)=$1650. is that correct???


it can be solved by logic without models

Hi

yes, that's correct.

cheers.

[Champion]

Hi,

Need help with the following question

Mr. and Mrs. Kumar and their children are sharing a packet of jelly-beans. If each of them takes 8 jelly-beans, there would be 4 jelly-beans left over. But if each of them takes 9 jelly-beans. there would be 3 jelly-beans short. How many children do Mr and Mrs. Kumar have? Please show your working with model presentation carefully.

:thankyou:

[24hr-mum]

i not sure how to draw the model but i think the answer is 7 children, becos in order for each child to have one more item (ie from 8 beans to become 9 beans), u have to use up the 4 left over and the 3 that were shortage. 4+3 =7. so if u try 78=56, 56+4=60. they hv 60 beans.

97=63, u hv 3 shortage.