jay bee:

Imagine a large empty bin.  Say that each minute people would come and put in one golf ball a piece.  The first minute (starting at 12 noon), 1 person came and put in a ball.  The second minute, 2 people put in one ball a piece.  A minute later, 4 people put in 1 ball a piece.  This pattern continued until the bin was exactly full at 6pm.  At what time was the bin half empty?

~Sauron~:

The sum of the fourth and twelfth term of an arithmetic progression is 20. What is the sum of the first 15 terms of the arithmetic progression?

(A) 300
(B) 120
(C) 150
(D) 170
(E) 270

C2H5OH:

lol
and the volume of the cylinder is 16/pi . good job anti tope.

TOPE2000!:

5:59 - Because each minute, the number of balls double

TOPE2000!:

5:59 - Because each minute, the number of balls double

~Sauron~:

The sum of the fourth and twelfth term of an arithmetic progression is 20. What is the sum of the first 15 terms of the arithmetic progression?

(A) 300
(B) 120
(C) 150
(D) 170
(E) 270

~Sauron~:

The difference between the value of a number increased by 12.5% and the value of the original number decreased by 25% is 30.
What is the original number?

C2H5OH:

The figure shows a square with side-length of 2cm touching a circle at 4 points.

What is the area of the region shaded?

a. pi - 2
b. pi - 4
c. 2pi - 2
d. 2pi - 4
e. 3pi - 2
f. 3pi - 4

davidylan:

original number is 80

jay bee:


Which weight requires the least force to move?

4 Play:

This is an original(ish) question. Won't find it anywhere else.  

Nairalanders organise a BBQ at which less than a score of people attend. 2/3rds of the male attendants came with a partner whilst 3/5ths of the female attendants also came with a partner. What is the number of people who came without a partner?  

Options: 1,2,3,4,5,6,7,8,9,10

~Sauron~:

A train traveling at 100 kmph overtakes a motorbike traveling at 64 kmph in 40 seconds.
What is the length of the train in meters?

~Sauron~:

A train traveling at 100 kmph overtakes a motorbike traveling at 64 kmph in 40 seconds.
What is the length of the train in meters?

TOPE2000!:

400m

RichyBlacK:

400 meters!

RichyBlacK:

Men = 6
Women = 5

2/3 of 6 = 4
3/5 of 5 = 3

Total = 4 men + 4 partners + 2 single men + 3 women + 3 partners + 2 single women = 18 < 20 = 1 score

Total # of singles = 2 + 2 = 4

TOPE2000!:

Its A. Weight A requires a force equal to 5 Kg whereas weight B requires a force equal to 10 Kg.

4 Play:

@Richy

Thanks for trying. No mind the rest wey no bother  

The number of men with partners must match the number of women with partners. You inverse the normal way of calculating fractions by finding the LCD of the numerator! In this case, 6. 2/3 + 3/5 becomes 6/9 + 6/10 = 12/19

7 is the number of singles. 12, 6men and 6 women, is number that came with partners

davidylan:

B.

RichyBlacK:

4 play,

Check your solution or question again. From your solution, the total number of attendants at the party will be greater than 20.

TOPE2000!:

wanna bet?

TOPE2000!:

wanna bet?

jay bee:

A is the correct answer.
Tope is def cheating. i am going to raise the bar

jay bee:

A is the correct answer.
Tope is def cheating. i am going to raise the bar

RichyBlacK:

Tope is not cheating! She hasn't forgotten the concept of Mechanical Advantage in elementary physics . A has an MA of 2, while B has an MA of 1.

jay bee:

A is the correct answer.
Tope is def cheating. i am going to raise the bar