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[MathIzzzFun]

bookwormkids:

MathIzzzFun:

[quote=\"bookwormkids\"]Mary was preparing some lemon syrup concentration for her friends. The amount of lemon syrup initially used was 3/7 the amount of water used. To make it more diluted, she decided to add 1100 ml more water into the syrup drink such that 1/5 of the concentration was syrup. How much syrup did she use?


Thank you.

Hi
key --> amount of syrup remained the same

At first --> Lemon syrup : Water = 3u : 7u
In the end --> Lemon syrup : Water = 1: 4 = 3u : 12 u

12u - 7u --> 1100 ml , 1u --> 220 ml
Amount of Lemon syrup --> 3u --> 3 x 220 ml = 660 ml

cheers.

Hi! Thank you for your help,MathIzzzFun. [/quote]u r welcome

cheers.

[concern_mum]

hi, pls assist with the following question:


Question 1
The ratio of the number of Justin’s stamps to the number of Sean’s stamps is 3:5. When Justin gives 65 stamps to Sean, the ratio of the number of Justin’s stamps to the number of Sean’s stamps becomes 1:3. How many stamps did Sean have at first?

Question 2
There were 60 pupils in the canteen, 3/5 of them were girls. When some girls left the canteen, the number of girls who remained in the canteen was 1/4 of the total number of pupils who remained in the canteen. How many girls left the canteen?

[MathIzzzFun]

concern_mum:

hi, pls assist with the following question:


Question 1
The ratio of the number of Justin's stamps to the number of Sean's stamps is 3:5. When Justin gives 65 stamps to Sean, the ratio of the number of Justin's stamps to the number of Sean's stamps becomes 1:3. How many stamps did Sean have at first?

Question 2
There were 60 pupils in the canteen, 3/5 of them were girls. When some girls left the canteen, the number of girls who remained in the canteen was 1/4 of the total number of pupils who remained in the canteen. How many girls left the canteen?

Hi

q1- total number of stamps remains the same.
at first, Justin : Sean --> 3u : 5u
in the end, justin : Sean --> 1:3 --> 2u : 6u
So, we see that Justin gave 1u to Sean.
1u --> 65, 5u --> 5 x 65 = 325

q2- number of boys in canteen remained the same.
at first, Number of boys = 2/5 x 60 = 24, number of girls = 60-24= 36
in the end, number of boys = 24 --> 3/4 of pupils remained in canteens
so, 1/4 of pupils --> 24/3 =8 --> 8 girls remained in canteen
36 - 8 = 28 girls left the canteen.

cheers.

[ongmt]

Fazillah, Linda and Winnie each owned a collection of comics. The total collection owned by Linda and Winnie was 3/2 as many comics as Fazillah owned. Linda owned 4/5 as many comics as the total collection owned by fazillah and Winnie. If Winnie owned 169 fewer comics then Linda, how many comics must Fazillah and Linda each give to Winnie in order for the three :? gilrs to have same number of comics?


Plse help.

[MathIzzzFun]

ongmt:

Fazillah, Linda and Winnie each owned a collection of comics. The total collection owned by Linda and Winnie was 3/2 as many comics as Fazillah owned. Linda owned 4/5 as many comics as the total collection owned by fazillah and Winnie. If Winnie owned 169 fewer comics than Linda, how many comics must Fazillah and Linda each give to Winnie in order for the three :? gilrs to have same number of comics?


Plse help.

Hi

Fazillah : Linda + Winnie --> 2 : 3
Fazillah : Linda + Winnie + Fazillah (=Total) --> 2 : 5

Linda : Winnie + Fazillah --> 4 : 5
Linda : Linda + Winnie + Fazillah (=Total)--> 4 : 9

Equalize Total -
Fazillah : Total --> 18u : 45u
Linda : Total --> 20u : 45u
So, Winnie --> 45u - 18u - 20 u = 7u

Linda had 169 more comics than Winnie
So, 20u - 7u --> 169
13u --> 169, 1u --> 13 comics

Total --> 45u, 45u / 3 = 15u --> each girl will have 15u in the end.
Number of comics given by Fazillah to Winnie --> 18u - 15u = 3u --> 39 comics
Number of comics given by Linda to Winnie --> 20u - 15u = 5u --> 65 comics

cheers.

[ongmt]

:thankyou: - MathIzzzFun

[Chongalicia]

Thanks for sharing ur knowledge. Really helpful!

[cherinelee]

Wow…glad to hv found my ans for my DS.


Thanks.

[MathIzzzFun]

u r welcome


cheers.

[esibuyer]

Hi, can solve the following question for my girl.

Grandma is 80 years old and his son is 52 years old. How many years ago was Grandma thrice as old as his son?
Thanks