Q&A - P3 Math

[chokos]

How to solve the P3 math question:

There were a total of 50 cockroaches and spiders in a container.
There were 356 legs altogether.
How many cockroaches were there in the container?

Answer is 22 cockroaches.

[Herbie]

There were a total of 50 cockroaches and spiders in a container.


Assume all are cockroaches = 50x6 = 300 legs

356-300= 56
Different between the cockroaches legs = 8-2

No. of spider =56/2 = 28

No. of cockroaches = 50-28= 22

[bitchymum]

Jay and Lak were given an equal amount of money by their parents.

After Jay spent $24 and Lak spent $12, Lak had 4 times as much as Jay had left. How much was each of them given at first? Pls help to solve using models … TIA

[Dharma]

bitchymum:

Jay and Lak were given an equal amount of money by their parents.

After Jay spent $24 and Lak spent $12, Lak had 4 times as much as Jay had left. How much was each of them given at first? Pls help to solve using models ... TIA

http://www.postimage.org/image.php?v=Pq9WRB9

[amberzbon]

Hi, I need help in these 2 qns


1) Ann spent $5850 on some bags and wallets. She bought 5 times as many bags as wallets. She paid $4400 more for bags than wallets. Each bag cost $60 more than a wallet. Find the cost of one wallet.

2)Eileen gets $2 more allowance than Mabel each week. Each girl spends $21 per week and saves the rest. When Eileen saves $72, Mabel only saves $48. How much allowance does Mabel get each week?

Thanks in advance
[/b]

[Suz855]

Dear Amberzbon


1) Ann spent $5850 on some bags and wallets. She bought 5 times as many bags as wallets. She paid $4400 more for bags than wallets. Each bag cost $60 more than a wallet. Find the cost of one wallet.

b [ ][ ][ ][ ][ ] + difference ** (b + w = 5850)
w [ ]

4u + difference = 4400
6u + difference = 5850, 2u = 5850 - 4400 = 1450
1u = 725

4u (bag) + difference = 4400
difference = 4400 - (4x725) = 1500

no. of bags = 1500 divide 60 = 25
therefore, no. of wallets –> 25 divide 5 = 5

5 wallets cost $725, 1 wallet therefore cost $145

[Vanilla Cake]

amberzbon:

2)Eileen gets $2 more allowance than Mabel each week. Each girl spends $21 per week and saves the rest. When Eileen saves $72, Mabel only saves $48. How much allowance does Mabel get each week?

If Eileen get $2 more allowance than Mabel each week, Eileen's weekly saving will be more than Mabel's weekly saving by $2.

E: [Spent=$21][Saving][$2]
M: [Spent=$21][Saving]

Difference in total savings
$72-$48 = $24

Eileen saves $2 more in 1 week and to save $24 more, it will take 24/2 = 12 weeks.

To save $48, Mabel will also need 12 weeks.
In 1 week, Mabel saves $48/12 = $4

Weekly allowance for Mabel = Spent+saving = $(21+4) = $25

Submitted by VC's mum

[wahwah]

Can someone help me with the following P3 Math problem sum? Many thanks in advance.


Bob has thrice as many buttons as Ali. Ali has 179 buttons lesser then Carlos. Carlos has 228 buttons more than Ali and Bob. How many buttons do the three boys have altogether?

[Dharma]

wahwah:

Can someone help me with the following P3 Math problem sum? Many thanks in advance.


Bob has thrice as many buttons as Ali. Ali has 179 buttons lesser then Carlos. Carlos has 228 buttons more than Ali and Bob. How many buttons do the three boys have altogether?

Hi,

Think there's something wrong with your Qn. How can Carlos have 179 buttons more than Ali when the next sentence says that Carlos has 228 more buttons than Ali and Bob?

[Muffins]

wahwah:

Can someone help me with the following P3 Math problem sum? Many thanks in advance.


Bob has thrice as many buttons as Ali. Ali has 179 buttons lesser then Carlos. Carlos has 228 buttons more than Ali and Bob. How many buttons do the three boys have altogether?

Hi wahwah, I think the question is a little wrong as, when I try to work it out, I keep getting thhat 1 unit is equal to 4 units + 48. Could you please get back to us on this? Thanks!