## How many coins can cover the entire table?

A rectangular table has 100 coins placed on it (centers must be on the table) such that none of the coins overlap, and it is impossible to place any...

Be the 1st to Reply
## Calculate the amount paid in each installments

An Electrical shop sells a video recorder for $3200 cash price. The purchase deal is offered to a customer at an extra 20% cost. The customer pays a deposit...

Be the 1st to Reply
## Change in Temperature wrt time

A roasted turkey is taken from an oven when its temperature has reached 185°F and is placed on a table in a room where the temperature is 75°F. (a)....

1 Replied
## Distance Time

A cargo plane flew from the Clark across the Pacific at 255 kph and flew back to the Clark at 275 kph. Given that the first trip took 2...

1 Replied
## One dimensional collision

A 1200kg car traveling initially at 25m/s in an eastern direction crashed into the back of a 9000kg truck moving at the same direction at 20m/s. The velocity of...

2 Replied
## Largest possible sum

In the year 2001, the International Mathematics Olympiad was held in the USA. Let be distinct positive integers such that the product I * M * O =...

1 Replied
## Base conversion

If (11011)2 = (____________)10, then the number in the blank space is: a. 33 b. 22 c. 27 d. 30

1 Replied
## Sum of numbers on the faces of a cube

Positive integers are written on all the faces of a cube, one on each. At each corner (vertex) of the cube, the product of the numbers on the faces...

1 Replied
## Percentage change in salary

A man’s salary was first increased by 10% and then decreased by 10%. What is the total percentage change in his salary?

1 Replied
## Vector resolution

The magnitude of each force vectors is 6N, and the angle between them is 120° as shown. Find the magnitude and direction of the resultant vector.

1 Replied
## Age problem-2

One number is 3 times another number. If the larger number is diminished by 8, the resultant is 7 more than twice the smaller number. Find the numbers.

1 Replied
## write equation for polynomial

Write an equation for a polynomial that has the solution set {-1 , 3, 4}

1 Replied
## Speed, distance and time

A bicycle wheel has a diameter of 63cm. Calculate how many times the wheel turns round in traveling km. Use the value 22/7, for π

1 Replied
## Geometry question

BM and CN are altitudes of triangle ABC. If |AB| = cm, |AC| = cm and |BM| = cm, calculate the area of triangle ABC, and...

1 Replied
## Find a x b x c x d

If a, b, c and d are unique digits and aaaa + bbb + cc + d = 1995, find the value of a * b * c *...

1 Replied
## Prove that 12b^2 = 49ac

Given: ax^2 + bx + c = 0 The proportion of the roots of the equation is 3:4. Prove that 12b^2 = 49ac

1 Replied
## Statistics-Mean

In computing a mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers and obtained 20 as mean. Find the correct ...

1 Replied
## Lengths of sides of triangles

Calculate the length of the sides opposite to the given angle in triangle ABC. B = degBC = 5 cm AB = 8 cm

2 Replied