Q&A - PSLE Math

[dora miscq]

Boa Di had 30 dollar, 20 dollar and 10 dollar tickets for a school concert in the ratio 1:5:4. The total value of the concert tickets was $3060.


How many 10 dollar tickets had he?

[charsen]

dora miscq:

Boa Di had 30 dollar, 20 dollar and 10 dollar tickets for a school concert in the ratio 1:5:4. The total value of the concert tickets was $3060.


How many 10 dollar tickets had he?

Hi,
You can solve this Question by Quantity x Value.
$30x1=30
$20x5=100
$10x4=40
total-100+40+30=170
3060/170=18
He had 18 sets of 1:5:4 .
From here,you can solve the question.
cheers

[Michaelia0816]

Anyone help?


A group of girls shared some sweets among themselves. They tried taking 11 sweets each, but found that the last girl had only 6 sweets. When each girl took 8 sweets, there were 25 sweets left over. How many sweets were there altogether?

[tianzhu]

Michaelia0816:

Anyone help?


A group of girls shared some sweets among themselves. They tried taking 11 sweets each, but found that the last girl had only 6 sweets. When each girl took 8 sweets, there were 25 sweets left over. How many sweets were there altogether?

Hi girl

This is a tweaked version of the familiar “excess and shortage” type of questions.

Restate the question in another way and I am sure you’ll find it familiar.

A group of girls shared some sweets among themselves. If each of them were to take 11 sweets, they would be short of 5 sweets. If each girl were to take 8 sweets, they would have 25 sweets left.How many sweets were there altogether?

25 + 5 ------- 30

11 – 8 ------ 3

Number of girls ----- 30/3 ------- 10

Number of sweets ------- (10*8) + 25 ------ 105

Best wishes

[Michaelia0816]

Thx, Tianzhu, now I understood, that why I Cannot get it correct!

[2DMommy]

Need help for these 2 questions :


1) The average height of a group of children was 139.4cm. When the height of these children was measured and recorded, one child’s height was wrongly recorded as 192cm when it should have been 129 cm. As a result, the average height of this group of children was calculated as 142.4 cm. How many children were there in the group?

2) 3 friends bought the same number of fruits each. Alan bought 5 oranges and some apples and paid $7.80. BOb bought 11 oranges and some apples and paid $9. How much did Chris pay if he bought only apples ?

Thank u !

[tianzhu]

2DMommy:

Need help for these 2 questions :


1) The average height of a group of children was 139.4cm. When the height of these children was measured and recorded, one child's height was wrongly recorded as 192cm when it should have been 129 cm. As a result, the average height of this group of children was calculated as 142.4 cm. How many children were there in the group?

Hi

This question has been discussed before.

Best wishes

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=69&t=280&hilit=2180+black&start=6400

[tianzhu]

2DMommy:

2) 3 friends bought the same number of fruits each. Alan bought 5 oranges and some apples and paid $7.80. BOb bought 11 oranges and some apples and paid $9. How much did Chris pay if he bought only apples ?

Hi

9 – 7.8 ------ 1.2

11 – 5 ------ 6

1.2/6 ------ 0.2

An orange costs 20 cents more than an apple.

Chris ------ 7.8 - (5*0.2) ------- 6.8

or 9 - (11*0.2) ------ 6.8

Best wishes

[Shimmer]

Need help please Tianzhu !


1. A car and lorry which were 80k/m apart started to travel towards each other at the same time . The car 40km/h faster than the lorry. They went past each other after 2/5 hours.
A How far the lorry travel when it pass the car?
B Find the speed of lorry


2)A fan club had 150 members last year.This year, the no. of male reduces by 20% and the no. of female increase by 20%. As a result, there are as many male as females. How many people have this?


3)There were some balloons .25 burst and 10% flew. If there were 60% of balloons left, how many balloons were at first?

[alng]

Hi, please help me with this question. Thanks!


Jason has some chocolate and macadamia nuts cookies. If he sells 16 chocolate cookies and 4 macadamia nuts cookies a day, he would have 65 chocolate cookies left by the time all the macadamia nuts cookies are sold. If he sells 8 macadamia nuts cookies and 4 choclate cookies a day, he would have 289 chocolate cookies left by the time all the macadamia nuts cookies are sold. How many chocolate cookies does he have?