Tutor MathsGuru: Ask me for your burning Maths questions!

[tianzhu]

liketoeat:

2) Car A left Town X for Town Y at the same time when Car B left Town Y for Town X. The average speed of Car A was 56 km/h and the average speed for Car B was 72 km/h. The two cars passed each other at a point 24 km from the midway of the two towns. What is the distance between Town X and Town Y? (Ans: 384km)

Hi

One way to solve this question is to use the concept that distance varies in direct proportion to speed. The faster the speed, the more distance is covered.

Car A ----- Speed ---- 56(7) ------- Distance -------7u
Car B ------ Speed ----- 72(9) -------Distance -------9u

The midpoint is at 8u (16/2)
1u ------24 km
16u ------384 km

Best wishes

[Cheerfuldad]

Hi all,


Please help!

Q. 400 people took part in a camp. 73 of them were adults and the rest were children. 2/5 of the boys and 1/4 of the girls were lower primary pupils while the rest of them were upper primary pupils. There were 9 more upper primary girls than upper primary boys.

a) How many upper primary pupils were there?

b) What percentage of the people who took part in the camp were girls?


TIA

[Dreamybee]

Anyone has Maths Guru contact pls?


My twins are not performing for PSLE Maths and I am on the verge on giving up…

I did send to tuition centre, private tutors etc but its not working out…

Moreover, Maths is not my forte…PLS HELP ME!!! Tks alot…

[tianzhu]

Dreamybee:

Anyone has Maths Guru contact pls?


My twins are not performing for PSLE Maths and I am on the verge on giving up...

I did send to tuition centre, private tutors etc but its not working out....

Moreover, Maths is not my forte...PLS HELP ME!!! Tks alot...

Hi

Please follow this link.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6311

You may send her a private message or email.

Best wishes

[Dreamybee]

tianzhu:

Dreamybee:

Anyone has Maths Guru contact pls?


My twins are not performing for PSLE Maths and I am on the verge on giving up...

I did send to tuition centre, private tutors etc but its not working out....

Moreover, Maths is not my forte...PLS HELP ME!!! Tks alot...

Hi

Please follow this link.
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6311

You may send her a private message or email.

Best wishes

Tks alot Tianzhu, you have been very kind and helpful....I really appreciate any form of support now...

[liketoeat]

tianzhu:

liketoeat:

2) Car A left Town X for Town Y at the same time when Car B left Town Y for Town X. The average speed of Car A was 56 km/h and the average speed for Car B was 72 km/h. The two cars passed each other at a point 24 km from the midway of the two towns. What is the distance between Town X and Town Y? (Ans: 384km)

Hi

One way to solve this question is to use the concept that distance varies in direct proportion to speed. The faster the speed, the more distance is covered.

Car A ----- Speed ---- 56(7) ------- Distance -------7u
Car B ------ Speed ----- 72(9) -------Distance -------9u

The midpoint is at 8u (16/2)
1u ------24 km
16u ------384 km

Best wishes

Thank you, Tianzhu.

[liketoeat]

Brenda10:

liketoeat:

1) Jane has some money. After spending $100 on 3 bags and 7 belts, she is short of $4 if she wants to buy another bag. However, if she buys 1 more belt, she will have $6 left.

a) How much does one bag cost? (Ans: $13)
b) How much does Jane have? (Ans: $109)

Hi, I have come across the similar question. However now I try to solve this question by following the previous sample I couldn’t get the answer same as you provided. I can only get (a) $17, (b) $113

That’s mean that I kept the wrong sample!! :!: Sorry not able to help and I also need to seek help from the rest.

I've got this solution but didn't quite understand, could someone please explain to me... thank you.

$4 + $6 = $10
$100 + $10 x 7 = $170

$170 / (3 + 7) = $17 (a)

$100 + $17 - $4 = $113 (b)

[tianzhu]

Cheerfuldad:

400 people took part in a camp. 73 of them were adults and the rest were children. 2/5 of the boys and 1/4 of the girls were lower primary pupils while the rest of them were upper primary pupils. There were 9 more upper primary girls than upper primary boys.
a) How many upper primary pupils were there?
b) What percentage of the people who took part in the camp were girls?

Hi

I’ll describe how to do it by MD.

400 people – 73 adults ----- 327 children

The units representing boys and girls are different.

Boys ----- 3parts (UP)----- 2 parts (LP)
Girls ----- 3 units (UP)----- 1 units (LP)

3 units is greater than 3 parts by 9
Therefore 1 unit is greater than 1 part by 3

5parts+4units ------ 327
5parts+ (4parts +12) -----327

9parts ----- 315
1 part -----35
Hence, 1 unit ---- 38

a)Number of upper primary boys ------(35*3) -----105
Number of upper primary girls -----(105+9) ----- 114
Number of upper primary pupils -----219

b)Number of girls ------(38*4) -----152
Therefore the percentage of girls to number of people ------152/400*100 ----- 38%

Hope this helps.

Best wishes

[tianzhu]

Dreamybee:

Tks alot Tianzhu, you have been very kind and helpful....I really appreciate any form of support now...

Hi

No worries.
I am a father too and I wish every child will enjoy going to schools.

Best wishes

[Brenda10]

liketoeat:

Brenda10:

[quote=\"liketoeat\"]1) Jane has some money. After spending $100 on 3 bags and 7 belts, she is short of $4 if she wants to buy another bag. However, if she buys 1 more belt, she will have $6 left.

a) How much does one bag cost? (Ans: $13)
b) How much does Jane have? (Ans: $109)

Hi, I have come across the similar question. However now I try to solve this question by following the previous sample I couldn’t get the answer same as you provided. I can only get (a) $17, (b) $113

That’s mean that I kept the wrong sample!! :!: Sorry not able to help and I also need to seek help from the rest.

I've got this solution but didn't quite understand, could someone please explain to me... thank you.

$4 + $6 = $10
$100 + $10 x 7 = $170

$170 / (3 + 7) = $17 (a)

$100 + $17 - $4 = $113 (b)[/quote]Hi Liketoboat

Paiseh. I am not good in explination :oops: but the following is my working step:

$4 + $6 = $10

1 Bag [ ]$10]
1 Belt [ ]

7 belts = 7 [ ]
3 bags = 3 [ ] + $30

10 [ ] = $100 - $30 = $70
1 [ ] = $7

$7 + $10 = $17
Each bag cost $17

Original amount : $100 + $7 + $6 = $113

Sorry unable to draw the model. This [ ] represent a rectangle model box