Thank you for your help.

alfretztay:

Ender:

[quote=\"bcmum\"]Hi, need help on MGS prelim qns.

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Thanks.

Use area mapping. Put 1 into region when you add an area and take away 1 when you minus an area.
So if you add the quadrant area, and minus the Triangle, you'll find one shaded region with a 1 and the other shaded region with a -1, the unshaded region becomes 0. That is the difference between the shaded region.

Difference in area between two shaded part,
Area of Quadrant - Area of Triangle

Area of Quadrant = Pi 10 X 10 = 100pi cm2
Area of Triangle = 0.5 X 15 X 10 = 75 cm2

Difference in area between two shaded part = 100pi =75 = 239 cm2

I would solve the above problem as follows :

Note that the difference in area between the 2 shaded part is the area of quadrant less area of right-angled triangle.
2u ------- 10cm
1u ------- 5cm
3u ------- 15
Area of quadrant ------- (1/4) x pi x 10 x 10 = 78.5 sq cm
Area of triangle ------- (1/2) x 15 x 10 = 75 sq cm
78.5 - 75 = 3.5

Ans : 3.5 sq cm[/quote]

Hi, need help on MGS prelim qns.


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http://i62.tinypic.com/11l7cds.jpg\">

Thanks.

Hi, Appreciate help on this question.


MGS 2015 Prelim
Alex and Jack took part in a cycling race. Jack cycled at a speed of 24 km/h. Both of them did not change their speed throughout the race. when Alex reached the halfway point, Jack was 3km ahead of him. Alex reached the end point at 12.10pm. At what time did Jack reach the end point?

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First time getting a ex sg myanmar maid.

pls share what is your house rules on above mentioned.
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Hi, pls help me with this qn. Thks.


John spent $4968 on bags n shoes. The no of pairs of shoes he bought was 2/5 the number of bags he bought. The cost of a pair of shoes was $12 more than the cost of a bag. He paid $1512 more on bags than on shoes. Find the cost of a bag.

Pls help…

The avg age of Elvin’s friends was 11 years old. Elvin was 7 years old. After Elvin joined the group, the avg age became 10 years old. How many children were there in the group after Elvin joined in?

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Thank u..

Ender:

bcmum:

Q : The number of children increased by 15 to 35 at a party. What was the percentage increase in the number of children?

We are confused with the wording... increased by... increased to... what is the different?

Thks.

When we ask what's the percentage increase or decrease, it is usually reference to the original number. The number that it began with.

In this case,
the original number is 20.
It increase by 15.
It increased to 35.

Reference to original number 20, the percentage increase is (15/20) X 100 = 75%.
So it increased by 75%.

Q : The number of children increased by 15 to 35 at a party. What was the percentage increase in the number of children?


We are confused with the wording… increased by… increased to… what is the different?

Thks.

Hi,

May i know where i can purchase the following books?

A* Maths Problems; 2nd Edition
For Upper Primary High Achiever pupils aiming for A* grade
Author: Federick Ho
General Editor: Dr Spario Soon

Thanks.