Q&A - P4 Math

[Xiao Hu]

vsk:

Can someone help with this ?


Ming Xun had an equal number of blue and green marbles. After giving away 36 blue marbles and buying another 84 green marbles. he found that he had 4 times as many green marbles as blue marbles. How many blue marbles did Ming Xun have at first ?

Thank you.

Please see
http://i47.tinypic.com/mt56iu.jpg\">
4u-1u=84+36
3u =120
1u=40

So at first, Blue marbles= 1u+36=76.

[Jamesbond]

Xiao Hu:

vsk:

Can someone help with this ?


Ming Xun had an equal number of blue and green marbles. After giving away 36 blue marbles and buying another 84 green marbles. he found that he had 4 times as many green marbles as blue marbles. How many blue marbles did Ming Xun have at first ?

Thank you.

Please see
http://i47.tinypic.com/mt56iu.jpg\">
4u-1u=84+36
3u =120
1u=40

So at first, Blue marbles= 1u+36=76.

My Ds answer is also 76.

[vsk]

Mathshub/Xiao Hu/Jamesbond,


:thankyou: Appreciate very much.

[Sharmum]

verykiasumummy:

1 - 2/5 = 3/5 (remainder)
3/5 x $480 = $288
1 - 1/4 = 3/4 (spent on 4 blouses)
3/4 x $288 = $216 (4 blouses)
$216 / 4 = $54 (each blouse)

ans : $54

verykiasummy & SarCha,

Many thanks for your help!


:thankyou:

[verykiasumummy]

Sharmum:

verykiasumummy:

1 - 2/5 = 3/5 (remainder)
3/5 x $480 = $288
1 - 1/4 = 3/4 (spent on 4 blouses)
3/4 x $288 = $216 (4 blouses)
$216 / 4 = $54 (each blouse)

ans : $54

verykiasummy & SarCha,

Many thanks for your help!


:thankyou:

u r very welcomed...

[doraemo]

Can someone help me with this ?


Ray and Serene have a total of $1183 in their savings accounts. Serene and Tim have a total of $1124 while Ray and Tim have a total of $961.
How much savings does Tim have?

[Charnic]

doraemo:

Can someone help me with this ?


Ray and Serene have a total of $1183 in their savings accounts. Serene and Tim have a total of $1124 while Ray and Tim have a total of $961.
How much savings does Tim have?

R+S = 1183 ----------(1)
S+T = 1124 ---------- (2)
R+T =961 ------------- (3)
Add 2 and 3
R+S+2T = 2085
Compare the new equation to 1
1183+2T = 2085
2T = 902
T = 401

[doraemo]

Thank you, CNS!

[doraemo]

Here’s another one:-

A class has an equal number of boys and girls. ½ of the boys do not wear glasses and 15 girls do not wear glasses. 12 of the pupils wear glasses. How many pupils are there in the class?

[Charnic]

doraemo:

Here's another one:-

A class has an equal number of boys and girls. ½ of the boys do not wear glasses and 15 girls do not wear glasses. 12 of the pupils wear glasses. How many pupils are there in the class?

Is the answer 36 ? If so, below is the working :

U + [] = 12
[] + 15 = 2U
[] = 2U - 15
Substituting the 3rd equation into the first, you would get :
U + 2U - 15 = 12
3U = 27
U = 9
Boys + girls add up to 4U