Q&A - P5 Math

[mummyv]

lynntan15:

MathIzzzFun:

if 30 green apples added,
Green : Red --> 3 units + 30 : 1 unit + 10 (3:1)
number of apples,
Green : Red --> 3 units : 1 unit + 10 (Total--> 4 units + 10)
.

can elaborate further on this?

Don't really understand how 3 units + 30 : 1 unit +10? become 3 units : 1 unit + 10?

Thks very much.

hi

this is becos if 30 green apples are added ratio becomes 3:1
what MathIzzFun is doing is making the units the same with the first ration
therefore if 30 green apples are added, green apples are 3units + 30
red apples should be 1 unit +10

not sure if this helps

I also realised the method drawing explains it too

http://i46.tinypic.com/2a8omrq.jpg\">

[mummyv]

usaik:

Hi I need help on the following question, particularly on how to solve and get the answer for part (b).


Mrs Tan bought 4 times as many toy guns as teddy bears. She spent $1750 altogether. A toy gun cost $10 less than a teddy bear. The total cost of toy guns was $490 more than the total cost of teddy bears.
(a) how much did Mrs Tan spend on the teddy bears?
(b) How much did one teddy bear cost?

Thank you.

hi
this has been answered before by MathIzzzFun & Zack7
http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=660

[mummyv]

Applelyn1:

Hi need someone to help on the following 2 question, thank you.


Q1) Jame had some stickers. She gave 18 stickers to her sister and 5/7 of the stickers to Mary. Then, she used 3/4 of the remainder for her project and had 35 stickers left. How many sisters did she have at first?

hi

work backwards
1u = 35
4u = 35 x 4 = 140

4u + 18 = 2/7 of stickers
140+ 18 = 2/7 of stickers
therefore 7/7 of stickers is (140+18)/2 x 7 = 553 stickers

[mummyv]

Applelyn1:

Hi need someone to help on the following 2 question, thank you.


Q2) Ali , Bala and Carl shared 90 marbles. If Ali gave 6 marbles to Bala, Bala gave 2 marbles toCarl and after that Carl gave 1/4 of what he had then to Ali, the three boys will have the same number of marbles in the end. How many more marbles than Ali did Carl have?

hi

work backwards
three boys will have same number of marbles at the end = 90/3 = 30

After Carl gave 1/4 to Ali, 3/4 = 30
Carl original = 10 x 4 - 2 (Bala gave him 2) = 38

After Ali received 1/4 from Carl and gave 6 to Bala = 30
Ali original = 30 + 6 - 10 = 26

Difference Carl and Ali = 38 - 26 = 12 marbles

[mummyv]

YumYum:

Hi, need help with this qn:


Mrs lee spent 1/2 of her money on some almond cookies and 2/5 of the remaining money on 6 slices of butter cookies. Each slice of butter cookie costs thrice as much as one almond cookie. How many almond cookies did she buy?

Thanks

hi

not sure if this is correct, my attempt

2/5 remaining = 6 BC
5/5 = 15 BC
15BC is half amount spent

Amount spent on 1 BC = 3 AC
Therefore if same amount spent on 15 BC = 3 x 15 = 45 AC

[Applelyn1]

Hi mummyv :thankyou:

mummyv:

Applelyn1:

Hi need someone to help on the following 2 question, thank you.


Q1) Jame had some stickers. She gave 18 stickers to her sister and 5/7 of the stickers to Mary. Then, she used 3/4 of the remainder for her project and had 35 stickers left. How many sisters did she have at first?

hi

work backwards
1u = 35
4u = 35 x 4 = 140

4u + 18 = 2/7 of stickers
140+ 18 = 2/7 of stickers
therefore 7/7 of stickers is (140+18)/2 x 7 = 553 stickers

[lynntan15]

mummyv:

lynntan15:

[quote=\"MathIzzzFun\"]
if 30 green apples added,
Green : Red --> 3 units + 30 : 1 unit + 10 (3:1)
number of apples,
Green : Red --> 3 units : 1 unit + 10 (Total--> 4 units + 10)
.

can elaborate further on this?

Don't really understand how 3 units + 30 : 1 unit +10? become 3 units : 1 unit + 10?

Thks very much.

hi

this is becos if 30 green apples are added ratio becomes 3:1
what MathIzzFun is doing is making the units the same with the first ration
therefore if 30 green apples are added, green apples are 3units + 30
red apples should be 1 unit +10

not sure if this helps

I also realised the method drawing explains it too

http://i46.tinypic.com/2a8omrq.jpg\">[/quote]ohic.. thks a lot for the model, help to see it much clearer

[ILOVESCIENCE]

can anyone solve this?


Mike and Vince were selling sunglasses at $12 each and $7 each respectively. Total sales collected by both was $4905. The ratio of the number of sunglasses sold by Mike to those sold by Vince is 5:7. How many sunglasses did Mike sell?

thanks!

[MANGO STAR]

small:

MANGO STAR:

Hi, need help for this MCQ question.


16/? is between 4/9 and 4/7

1) 25 2) 28 3) 30 4) 36

After changed 4/9 and 4/7 to 16/36 and 16/28 then you will know the answer is 30.

Hi small,

got it. :thankyou:

[small]

MANGO STAR,


You are welcome.