Tutor MathsGuru: Ask me for your burning Maths questions!

[Guan Hui]

Solve using Percentage is easier to see for me=)

2/5=40%
1/2 left so remain=20%
+17 people=25%
so 5%=17 people
40%=17x8
=136 people^^



Both is correct moderators merge this with mathsguru thread?

[free willy]

thank you for all your help. The teacher has not gone through the question yet. I should have photocopy the Q, as such I can not verify the phrasing at this point. Nevertheless, the solution looks very logical. Is this methold called working backwards or internal transfer? [/quote]

[david59]

shemum:

Hi Maths Guru,


Please help me to solve the below question.

An MRT train was 2/5 full of passengers. At the first station, 1/2 of the passengers alighted and 17 people boarded the train. The train is now 1/4 full. How many passengers were there on the train at first?

Thank you.

Shemum

Using of model method, see attached
http://www.postimage.org/image.php?v=aVAM6fS

[Jolyn]

Hi Maths Guru


I have 2 questions as follows which need your help:

1. There were 84 more books on the self than in the box. Grace transferred 30 books from the box onto the shelf. How many more books are there on the shelf than in the box now?

2. At a sale, 1982 towels were sold. Out of these towels, 514 of them were face towels, 312 were hand towels and the rest were bath towels. how many more bath towels than face towels were sold?

Thank you very much.

[Guan Hui]

hi jolyn,


1)
when you transfer 30 books from box to shelf.
box will minus 30 books while shelf increase 30 books.
originally there were 84 more books on the shelf than box.
so… 84 +30+30=144 more books on shelf than in box now.

2)
514 face towels 312 hand towels
total = 514+312=826 towels
Total towels sold =1982
Number of bath towel=1982-826=1156
how many more? 1156-514=642 towels more

[Jolyn]

Guan Hui:

hi jolyn,


1)
when you transfer 30 books from box to shelf.
box will minus 30 books while shelf increase 30 books.
originally there were 84 more books on the shelf than box.
so... 84 +30+30=144 more books on shelf than in box now.

2)
514 face towels 312 hand towels
total = 514+312=826 towels
Total towels sold =1982
Number of bath towel=1982-826=1156
how many more? 1156-514=642 towels more

Hi Guan Hui

Thanks for your answer but I do not understand as follows:

1. Why it is 84+30+30 and not 84+30-30? As box minus 30 and shelf increase 30....

Thks
Jolyn

[Vanilla Cake]

Hi Mathsguru,

Pls help to solve this problem sum using models and TIA

Gabriel had some guppies. He gave 1/4 of it to Jenni.
Jenni had some mollies. She gave 2/5 of it to Gabriel.
Later 30 of Gabriel's mollies died. As a result the ratio of Gabriel's guppies to his mollies became 3 : 1. Jenni bought another 80 mollies. After that the ratio of Jenni's guppies to her mollies became 1 : 4 as a result.
How many of mollies had Jenni at first?

[Maths Monster]

delete

[Maths Monster]

delete

[adhdadhd]

Vanilla Cake:

Hi Mathsguru,

Pls help to solve this problem sum using models and TIA

Gabriel had some guppies. He gave 1/4 of it to Jenni.
Jenni had some mollies. She gave 2/5 of it to Gabriel.
Later 30 of Gabriel's mollies died. As a result the ratio of Gabriel's guppies to his mollies became 3 : 1. Jenni bought another 80 mollies. After that the ratio of Jenni's guppies to her mollies became 1 : 4 as a result.
How many of mollies had Jenni at first?

Tis how I tried solving using model:


http://www.postimage.org/image.php?v=TsbpuT9