Q&A - P4 Math

[corneyAmber]

applepie:

Need help on this question please...


The total mass of 5 packets of flour and 4 packets of rice is 490 kg. Each packet of flour has a mass twice that of a packet of rice. What is the mass of each packet of flour ?

Thanks.

Let u be the mass of rice.
mass of flour is 2u.
5(2u) + 4(u) -> 490
14 u-> 490
u-> 35
2u -> 70
Mass of each packet of flour is 70kg

By ksi junior

[applepie]

Got it, thanks tian zhu and ksi…!

[concerned1970]

Hi, pls help to solve with a model diagram if possible. Ty!


1) Fatimah has 40 coins. Some of the coins are 50-cent coins and the rest are
20-cent coins. The total value is $16.10 How many 50-cent coins does Fatimah
have?

2) In a long jump competition, Paul jumped 0.16m further than Royston while
Shawn jumped 0.24m less than Paul. If the total distance jumped by the three
boys was 3.44m, how far did each boy jump?

[corneyAmber]

concerned1970:

Hi, pls help to solve with a model diagram if possible. Ty!


1) Fatimah has 40 coins. Some of the coins are 50-cent coins and the rest are 20-cent coins. The total value is $16.10 How many 50-cent coins does Fatimah have?

2) In a long jump competition, Paul jumped 0.16m further than Royston while Shawn jumped 0.24m less than Paul. If the total distance jumped by the three boys was 3.44m, how far did each boy jump?

1. Assume all 40 are 20-cent coins.
40 x 0.20 = 8
16.10-8.00 = 8.10
0.50 - 0.20 = 0.30

8.10/0.30 = 27

There are 27 50-cent coins.

Check: 27 x 0.50 = 13.50, 13x0.20 = 2.60 Total = 13.50+2.60 = 16.10

2.

P (__u___)(16)
R (__u___)
S (__u+16-24)

u+16 + u + u+16-24 -> 344
3u = 336
u = 112

Paul jumped (112+16)= 128 cm= 1.28m
Royston jumped 112cm = 1.12m
Shawn jumped 112-8 = 104cm = 1.04m


by ksi junior

[usaik]

Hi,


I need help on the working for the following question please. Thank you.

http://i56.tinypic.com/2d99pww.jpg\">

[corneyAmber]

http://i55.tinypic.com/2rdyq9g.jpg\">

[usaik]

Hi KSI,

:thankyou:

[corneyAmber]

usaik:

Hi KSI,

:thankyou:

You are welcome!

[concerned1970]

Thanks for yr help, Ksi!


But I don't know how to explain to my ds how to divide 8.10 divided by 0.30. Pls help.

[concerned1970]

I still need help on the following questions.


1)\tSerene made a patter using 4 shapes. The pattern is shown below. Which of the following is the 66th shape of the pattern?
H,S,T,C,H,S,T,C,H,S H-HEART, S-STAR, T-TRIANGLE, C-CIRCLE (SHAPES)
What is the easier method to tell the answer?

2)\tWhat is the first common multiple of 3 and 9? Is it 9 or 18?

3)\tWeiming has a square piece of paper with sides 6com. He cuts off a 1-cm square from each of the four corners. What is the perimeter of the remaining piece of paper? Is the answer 16cm?

4)\tThe cost of fencing a garden is $10 per metre. Mr Loh paid $480 to fence his square garden. What is the area of his garden?

5)\tThe cost of Toy A is ¼, the cost of Toy B and the cost of Toy C is ¾ of the cost of Toy A. Toy B costs $36 more than Toy A. a) How much does Toy A cost? b) How much does Toy C cost?

6)\tSimon and Alvin had 116 marbles at first. After Simon bought another 8 marbles and Alvin gave away 20 of his marbles to his sister, they both had the same number of marbles left. How many marbles did Alvin have at first?

7)\tThere are some pupils in class 4 Attentiveness. 1/3 of them like cycling, ¼ of them like swimming, 1/6 of them like roller-blading, and the rest like playing badminton. If 6 more pupils like playing badminton as compared to roller-blading, find the total number of pupils in the class.

Is the method correct?  1/3=4/12 (cycling), 1/4=3/12 (swimming), 1/6=2/12 roller-blading
4+3+2=9,
12-9=3 (3/12 likes badminton),
3/12 (badminton)-2/12 (roller-blading) =1/12 (6 pupils more)
6x12=72 (total pupils)

8)\tThere were 182 guests at Henry Park Hotel. The guests wanted to take a taxi to Sentosa Universal Studio. Transport was provided at a fixed price of $27 for 4 guests or fewer. What was the lowest possible transport cost for these 182 guests?

9)\tSome scouts were sitting in a circle around a campfire. They were evenly spaced out and numbered in order. The 3rd scout was sitting directly opposite the 11th scout. If 4 scouts were to leave the campfire, how many scouts were left?
Is the answer 12?

10)\tThe area of a square is 40cm2. What is the perimeter of the square?

11)\tAt a party, every girl was given 4 bars of chocolate and every boy was given 5 bars of chocolate. There were 5 times as many boys as girls at the party. Given that a total of 232 bars of chocolate were given out, how many boys were at the party?

12)\tTin A contains some 20-cents coins and Tin B contains some 50-cents coins. There are 9 more coins in Tin A than in Tin B. The amount of money in Tin A is $2.70 less than that in Tin B. How many 50-cent coins are there in Tin B?

13)\tDanny spent an equal amount of money on 7 packets of marshmallows and 5 packets of chocolate. Each packet of chocolate cost $0.60 more than a packet of marshmallows. What was the cost of a packet of marshmallows?