Siobhan wrote an exam which had 18 questions. Each question she answers correctly gets her 10 marks. However, she loses 5 marks for each question she answers incorrectly. She attempted all the questions and got a total of 75 marks. How many questions did she answer wrong?

225 cola cans and 360 fruit juice cans need to be stacked in a school canteen. If each stack is to be of the same height and has to contain cans of the same type, find the greatest number of cans each stack can have.

The ratio of the speeds of two trucks is 2:3. If the first truck covers a distance of 240 km in 3 hours, then how much distance will the second truck cover in 2 hours?

The angles of a pentagon are in the ratio ^@ 8:1:5:1:5. ^@ If the total measure of the angles of a pentagon is ^@540^{\circ},^@ find the measure of each angle.

In a magic square, the rows, the columns and the diagonals each add up to the same number. However, in this magic square, the numbers ^@56, 30, 35, 40, 14, \text{ and } 43^@ are missing.

^@27^@

^@c^@

^@22^@

^@y^@

^@b^@

^@q^@

^@48^@

^@a^@

^@z^@

What is the value of ^@c + y^@ in the given magic square?

A survey was done at Lotus Valley School to find the modes of transport used by the students to reach the school. The result of the survey is shown through the circle chart shown below:

Which is the most preferred means of transport for coming to school?