Q&A - P5 Math

[PiscesLeo]

Tank A and tank B are identical. 5/6 of tank A and 1/4 of tank B are filled with water. The mass of tank B with its contents is 7/13 of the mass of tank A with it’s contents. The total mass of the two tanks with their contents is 1400g. Find the mass of the empty tank.


Please help. Thanks

[Oldschool]

S-H:

Hi Oldschool, thank u for your answer, but I still could not understand, can u explain in model method, thanks.

Hi,

Just like to point out that the 2nd scenario cannot be a continuous event from the 1st.

Because they are already equal when Terence gave 117 to Ronald.
So if Terence continued to give Ronald, Ronald would have more and not less than Terence.
Hence, it starts from the beginning again.

Hopefully the diagram helps.

http://i41.tinypic.com/sb2ey1.jpg\">

Regards

[cookieandmonster]

Peter had 632 stamps and Freddy had 80 stamps. After their father had given them each an equal number of stamps, Peter had 5 times as many stamps as Freddy. How many stamps did their father give to each of them?

[doraemo]

please help: 2 questions


1.\tThere were some orange beads and 28 red beads and green beads in a container. There were two more green beads than red beads, and 6 fewer orange beads than red. How many beads were there altogether?

2.\tJar Y has 22 more sweets than Jar Z and Jar Z has 16 more sweets than Jar X. The total number of sweets in Jars Y and Z is 5 times the number of sweets in Jar X.

(a)\tHow many sweets are there altogether?
(b)\tHow many sweets should be transferred from Jar Y to the other two Jars so that there is an equal number of sweets in all three jars?

[2Transformer]

Please help on the following questions:-


1. Mr. Yong gave $840 of his salary to his mother and gave 1/5 of his remaining salary to his wife. If he had 1/3 of his salary left, how much was his salary?

2. Robert wanted to buy 12 erasers but he found that he was short of $0.80. If he bought 8 erasers, he would have $1.60 left over. How much money did Robert have?

3. There were 3/4 as many students in Camp A than in Camp B. After 25 pupils joined Camp B, the ratio of the number of students in Camp B to Camp A becomes 7:4. Find the number of students in Camp B at first.

[chloecube]

MathIzzzFun:

chloecube:

Three team A,B&C participated in a competition. There were 34 pupils in team B & C. If 22 pupil were not in team B n 28 pupil were in team C,how many pupil were there altogether in the three teams?

22 pupils not in Team B means
Team A & C --> 22

28 pupils not in Team C means
Team A & B --> 28

Team B & C --> 34

Total number of pupils in Team A & B & C --> (22 + 28 + 34) / 2 = 42

cheers.

:thankyou:

[MathIzzzFun]

2Transformer:

Please help on the following questions:-


1. Mr. Yong gave $840 of his salary to his mother and gave 1/5 of his remaining salary to his wife. If he had 1/3 of his salary left, how much was his salary?

Remainder --> 5 units
wife --> 1 unit
Left --> 4 units = 1/3 of salary
salary --> 12 units

12 units - 5 units = 7 units --> $840
1 unit --> $ 120

salary --> 12 x $120 = $ 1440

cheers.

[MathIzzzFun]

2Transformer:

Please help on the following questions:-


2. Robert wanted to buy 12 erasers but he found that he was short of $0.80. If he bought 8 erasers, he would have $1.60 left over. How much money did Robert have?

http://i39.tinypic.com/vqieps.png\">

4 erasers --> $ 1.60 + $0.80 = $ 2.40

1 eraser --> $ 0.60

Robert's money --> 8 x $ 0.60 + $ 1.60 = $ 6.40

cheers.

[MathIzzzFun]

2Transformer:

Please help on the following questions:-


3. There were 3/4 as many students in Camp A than in Camp B. After 25 pupils joined Camp B, the ratio of the number of students in Camp B to Camp A becomes 7:4. Find the number of students in Camp B at first.

The number of students in Camp A remained the same, so make the ratio part for Camp A the same in the \"start\" and \"end\" ratios.

At first, students in Camp A : Camp B = 3 : 4 --> 12u : 16u
In the end, students in Camp A : Camp B --> 4 : 7 --> 12u : 21u

Increase in number of students in Camp B = 21u - 16u = 5u

5u --> 25
1u --> 5

At first, number of students in Camp B --> 16 x 5 = 80

cheers.

[cookieandmonster]

Please help with this question:


Peter had 632 stamps and Freddy had 80 stamps. After their father had given them each an equal number of stamps, Peter had 5 times as many stamps as Freddy. How many stamps did their father give to each of them?