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 By: Geeta (offline)  Sunday, October 30 2011 @ 01:26 AM CDT (Read 1465 times)
Geeta

The length and breadth of a rectangle are both decreaased by 20%. By how many % will its area be decreased?

need help in this too...

How many digits are needed to form the numbers from 1 - 99 ?

Newbie

Registered: 12/31/06
Posts: 12

 By: NQS (offline)  Sunday, October 30 2011 @ 03:07 AM CDT
NQS

what school is this

Newbie

Registered: 09/16/10
Posts: 9

 By: sokechan (offline)  Sunday, October 30 2011 @ 03:18 AM CDT
sokechan

36%.

Eg.
Let's assume the rectangle is referring to a square. (A sq is a rect)

Original Length --> 10 cm
Area --> 100 cm2

After Length --> 8 cm
Area --> 64 cm2

100 cm2 - 64 cm2 = 36cm2
36/100 * 100 = 36%

Hope this helps...
And its from the Henry Park SA2 Mathematics 2010 Paper which I just did.

Junior

Registered: 02/25/11
Posts: 23

 By: NQS (offline)  Sunday, October 30 2011 @ 03:20 AM CDT
NQS

i thought the answer was 400%

Newbie

Registered: 09/16/10
Posts: 9

 By: Geeta (offline)  Sunday, October 30 2011 @ 03:30 AM CDT
Geeta

Thank u so much

Newbie

Registered: 12/31/06
Posts: 12

 By: sokechan (offline)  Sunday, October 30 2011 @ 04:02 AM CDT
sokechan

1 - 9 -> 9 digits
10 - 99 -> 180 digits
Total -> 189 digits

Junior

Registered: 02/25/11
Posts: 23

 By: Geeta (offline)  Sunday, October 30 2011 @ 04:48 AM CDT
Geeta

You are too good... Thanks again...

Newbie

Registered: 12/31/06
Posts: 12

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