tahihidungmasin Publish time 13-3-2013 11:53 AM

MATEMATIK & MACAM-MACAM - Jom Selesaikan Brain Teasers :)

QUESTION 1 (SENANG)
If there are 24 people at a party and each person shakes abother person's hand, how many handshakes are there?

QUESTION 2 (SUSAH SIKIT)
How many integers between 10 and 100 are divisble by 3?

QUESTION 3 (SUSAH)
It takes Ahmad 4 hours to do a job. It takes Ali 2 hours to do the same job. How many such jobs could they do together in 4 hours?

Last edited by dauswq on 30-3-2013 01:19 AM

mamiayu Publish time 13-3-2013 12:07 PM

Q1) 23 x24= 552
Q2) 30
Q3) 3

:2lol:

tahihidungmasin Publish time 13-3-2013 12:50 PM

mamiayu posted on 13-3-2013 12:07 PM static/image/common/back.gif
Q1) 23 x24= 552
Q2) 30
Q3) 3

Answer 1 = salah

Answer 2 = betul
From 10 to 100, you have 12, then 15, etc., up to 99
This is 4 x 3, 5 x 3, up to 33 x 3.
So there are 33 - 4 + 1 = 30 integers.

Answer 3 = betul
In 4 hours Ahmad can do one job, and in 4 hours Ali can do two jobs. So 3 jobs.

tahihidungmasin Publish time 13-3-2013 01:04 PM

PART II

QUESTION 1 (SUSAH SIKIT)
A survey of 50 people who can write showed that 20 could write only with their left hand and 10 could write with either hand.
How many could write with their right hand?
(a) 30(b) 20(c) 25(d) 10(e) 40

QUESTION 2 (SENANG)
The average of the number 10 and some unknown number, x, is divided by the sum of 10 and x. The result is 1/2.
What is the value of x?

QUESTION 3 (SUSAH SANGAT)
Jane is 3 times as old as Ann; three years ago, Ann was a year younger than Joyce is now.
If Ellen is twice as old as Ann, list the four girls in descending age order?

GOOD LUCK!!!

ira79 Publish time 13-3-2013 02:14 PM

Part 2,

1) 50 - 20 = 30 answer is (a) taking right hand only + either hand
2) [(10+x)/2]/(10+x)=1/2, then multiply both side dgn 10+x, dapat (10+x)/2 =(10+x)/2, then dapat 10+x = 10+x.. apa punya soalan nih?
3) Jane, Ellen, Ann, Joyce..

tahihidungmasin Publish time 13-3-2013 02:25 PM

ira79 posted on 13-3-2013 02:14 PM http://english2.cari.com.my/static/image/common/back.gif
Part 2,

1) 50 - 20 = 30 answer is (a) taking right hand only + either hand


Answer 1 = betul {:1_152:}
Tak yah bagi solution yer pasal senang jer. Kalau nak sila bagi tau.

Answer 2 = kira betul la ... heheheh ... jawapannya = cannot be determined :lol:

(10 + x)/2 divided by (10 + x) = 1/2
Cancel (10 + x), we get 1/2 = 1/2
Thus x cannot be determined.

Answer 3 = betul {:1_152:}
Translate from words to Math :
Ja = 3A
A - 3 = Jo -1
E = 2A
So, Ja = 3A,
A = Jo + 2,
E = 2A

So, Ja > E > A > Jo

tahihidungmasin Publish time 13-3-2013 02:41 PM

PART 3

QUESTION 1
There are four people in a line. Sarah is between Barry and Mary. Mary is in front of two other people, and John is directly in front of Mary.
Who is first in line, second, third, and fourth?

QUESTION 2
If A = 250 percent of B, what percent of A is B?
(a) 1/250 percent
(b) 25 percent
(c) 40 percent
(d) 50 percent
(e) 125 percent

QUESTION 3
What is the next letter in the following series : y z v w s t p q?

ira79 Publish time 13-3-2013 04:18 PM

nak balik dah la.. esok sambung..

tahihidungmasin Publish time 13-3-2013 04:23 PM

ira79 posted on 13-3-2013 04:18 PM static/image/common/back.gif
nak balik dah la.. esok sambung..

wokey sambung esok.

farsams Publish time 13-3-2013 05:00 PM

1. dari depan .....
    John , Mary , Sarah , Barry

2. 1/250 percent

3. y , z , v , w , s , t , p , q , m

tahihidungmasin Publish time 13-3-2013 05:07 PM

Jawapan esok Insya'allah.
Soalan 1 (Part I) tak ada jawapan lagi. Tak nak cuba?

Elle_mujigae Publish time 13-3-2013 09:43 PM

I try ye..hehe

P1Q1
(24*23)/2 : 276 Last edited by Elle_mujigae on 13-3-2013 09:52 PM

tahihidungmasin Publish time 14-3-2013 07:19 AM

Elle_mujigae posted on 13-3-2013 09:43 PM static/image/common/back.gif
I try ye..hehe

P1Q1


Betul ... congrats.

ira79 Publish time 18-3-2013 10:26 PM

musim sibuk la pulak... next question...
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