pensiveowl:

Could someone pls help with this question thanks


The ratio of Mr Lim's age to his daughter's age is 7 : 2.In 3 years' time, their total age will be 69 years.How old will the daughter be in 5 years' time?

Lims Age: Daughters age

7 : 2
Which is
7U : 2U

In 3 years time
7U+3 : 2U+3


Given that
7U+3+2U+3=69

Finding 1U
9U+6=69
9U = 69-6 =63

1U = 7

Current age Of Mr. Lim is 7x7=49
Current age of his daughter is 7x2=14

In 5 Years time daughters age will be 14+5=19 Years

edlynnalexander:

doraemo:

please help,


3)\tAhmad painted some toy cars in blue, red and green. 42 of them were painted in blue. 7/10 of the remaining toy cars were painted in red. The number of green toy cars was 21% of all the toy cars he painted. How many toy cars did he paint altogether?

http://i62.tinypic.com/sgtyww.jpg\">

Hi edlynnalexander,
Can you please explain how did u get the remainder as 70u?
Thanks.

MathIzzzFun:

At first, each has 21u of money (LCM of 3 & 7)

Greg:Tom: Carl:Mary
21u : 21u: 21u : 21u

Greg gave 1/3 to Tom ..1/3 x 1u = 7u :
Greg:Tom: Carl:Mary
14u : 28u: 21u : 21u

Tom gave 1/7 to Carl ..1/7 x 28u = 4u:
Greg:Tom: Carl:Mary
14u : 24u: 25u : 21u

Carl gave 1/5 & $50 to Mary..3/5 of 25u = 15u, in the end:
Greg -> 14u
Tom -> 24u
Carl -> 25u - 15u - $50 = 10u - $50
Mary -> 21u + 15u + $50 = 36u + $50

In the end, Mary had $770

36u + $50 = $770
u --> $20

I believe you can work out the rest...

cheers.

Hi MathIzzzFun,

I have tried the same problem with LCM of 3,7 and 5 (which is 105) and the answer is same as yours.

Yours is an easier solution. May I know the reason why the LCM for only 3 and 7 is taken?

Thanks.

brightlight:

Can anyone help with the following question


Daniel had a total of 446 local and foreign stamps. He gave away half of the local stamps and bought another 69 foreign ones. As a result, he had twice as many local stamps as foreign stamps.

(a) How many foreign stamps did he have at first?

(b) He sold all his foreign stamps at the same price and collected $123.60. What is the selling price of each foreign stamp?

I had managed to solve the problem myself. Solution as follows.

In the end, ratio of the Local to the foreign stamp is
2:1
which is 2u:1u

At first
Foreign stamps = 1u-69

For the local stamps end ratio, 2u is half of the original number of the local stamp, so at first would be twice of the 2u, so

Local stamps = 2u * 2 = 4u

At first total stamps = 446

local + foreign stamps
4u+1u-69 = 446
5u = 446+69= 515
1u = 103

At first foreign stamps is 1u-69, so

103-69=34

Total selling price of 103 foreign stamps = $123.60

Cost of 1 stamp = 123.60/103 = $1.20

a)He had 34 foreign stamps at first
b)selling price of each foreign stamp is $1.20

Can anyone help with the following question


Daniel had a total of 446 local and foreign stamps. He gave away half of the local stamps and bought another 69 foreign ones. As a result, he had twice as many local stamps as foreign stamps.

(a) How many foreign stamps did he have at first?

(b) He sold all his foreign stamps at the same price and collected $123.60. What is the selling price of each foreign stamp?

[quote=\"edlynnalexander\"]http://i58.tinypic.com/2cf4i6u.jpg\">

Thanks so much for your solution using other method. I am just getting familiar with the ratio. Your help is very much appreciated.

[quote]

Hi,

Same method can use to solve this question too.

http://i59.tinypic.com/2d15p8n.jpg\">

Cheers
Spt[/quote]
Thanks so much for the solution and the method. Very much appreciated.

marstolive:

Pls help! Thx:) http://i60.tinypic.com/9llr8m.jpg\">

see the picture for the answer.

http://i57.tinypic.com/15o87ky.jpg\">

Hi,


For the ratio problems, I am using the units and parts method as explained by Tianzhu in the link http://www.kiasuparents.com/kiasu/conte ... quantities.

can the same method be used for the following question? As i am very much clear with units and parts method, i prefer to solve with the same method. If the same method cannot be used what will be the easier way to approach it?

Problem goes here.

A box contained a total of 168 red and green markers in the ratio 3 : 4. An equal number of each type of markers was taken out. After that, the number of red and green markers was in the ratio 5 : 7. How many markers of each type were taken out?

thanks in advance.

Hi,


I missed viewing this forum topic, sorry about it. Atleast now I had a chance to see this. To introduce myself, I am a mother of two girls. One in K2 and the other one in playgroup.

I feel very glad to find this forum and to share my concerns with others and get their advice. Really a good forum for parents. Great job guys!!!

Cheers