Q&A - P5 Math

[pixiedust]

Ah, yes ! :thankyou: Piggylala and Tianzhu ! I get it now !


MathIzzFun, *case closed* thanks !

[ozora]

Need some help. The ratio of John’s cards to Ben’s cards was 3:4 After john bought another 9 cards and Ben lost 18 cards, the ratio was 3:2/ Find the total number of cards they had at first respectively.

[blueymum]

Dear all,


Appreciate your help in the following question:

A concrete mixer has a mixture of cement and sand. If 5.3 litres of cement were added, 75% of the mixture would be sand.
If 57.8litres of cement were added, 40% of the content will be sand.
Find the volume of cement in the mixture.

Thanks much!

[Herbie]

ozora:

Need some help. The ratio of John's cards to Ben's cards was 3:4 After john bought another 9 cards and Ben lost 18 cards, the ratio was 3:2/ Find the total number of cards they had at first respectively.

J:B
3u:4u
+9:-18
3p:2p

3u+9=3P
4u-18=2p

Hence 6u+18=6p
12u-54=6p

6u+18=12+54
U=12

J=3*12=36
B=4*12=48

[Herbie]

blueymum:

Dear all,


Appreciate your help in the following question:

A concrete mixer has a mixture of cement and sand. If 5.3 litres of cement were added, 75% of the mixture would be sand.
If 57.8litres of cement were added, 40% of the content will be sand.
Find the volume of cement in the mixture.

Thanks much!

15%=0.4 litres of cement
75%= 2 litres of cement

[MathIzzzFun]

blueymum:

Dear all,


Appreciate your help in the following question:

A concrete mixer has a mixture of cement and sand. If 5.3 litres of cement were added, 75% of the mixture would be sand.
If 57.8litres of cement were added, 40% of the content will be sand.
Find the volume of cement in the mixture.

Thanks much!

Hi

http://i56.tinypic.com/5uicub.jpg\">

cheers.

[Winx5015]

http://i52.tinypic.com/1z2f42p.jpg\">

[tianzhu]

Hi


a+b+d+f ---------360 (sum of interior angles in a 4 sided figure)

c+e+g -------180 (triangle)

a+b+c+d+e+f+g ------ 540

Divide the 6 sided figure (blue) into 4 triangles.

u+v+w+x+y+z --------4*180 -------720

Best wishes

[Essential]

Hi, need some help to solve this question.

The ration of Ben’s cards to Benny’s cards was 3:4 After Ben bought another 9 cards and Benny lost 18 cards , the ration became 3:2. Find the total number of cards Ben and Benny had at first.

[Essential]

Mathizzfun, could you help me with this question?

Rosie, sandy and Tabby shared a box of cards. Rosie took 1/5 of th total number of cards and another 12 cards. Sandy took 50% of the remaining cards in the box another 13 cards . Tabby took the last 27 cards in the box. How many cards were there in the box at first?