Simplifying an equation using conjugate surds
Trigonometrical equation
Monday, October 18, 2010
A typical trigonometrical equation which helps students practice important formulas and identities.
Trigonometry
A Secondary Olympiad question of maximum/minimum type which can be solved by Trigonometry.
fraction and remainder
Saturday, October 9, 2010
A question from a top school exam.
A similar question:
Every month Mum gives Cherry 400$ of which she spent 1/10 on transport.
Her spending on movie is half of her spending on transport and her spending on tuition is five times of her spending on transport and movie.
What is the remaining amount that Cherry would return to Mum at the end of the month?
1) 40
2) 50
3) 60
4) 30
Every month Mum gives Cherry 400$ of which she spent 1/10 on transport.
Her spending on movie is half of her spending on transport and her spending on tuition is five times of her spending on transport and movie.
What is the remaining amount that Cherry would return to Mum at the end of the month?
1) 40
2) 50
3) 60
4) 30
Total and average
Thursday, October 7, 2010
Question below is from a top school exam year 2007
Now try a similar question:
The average cost of some math books in a box was $15 at first. To double the number of books in the box, a number of science books whose total cost is unknown are added to the box. The average cost of books in the box now is 20. Then, all math books are removed from the box. What is average cost of books in the box now?
(1) 15
(2) 20
(3) 25
(4) 30
(1) 15
(2) 20
(3) 25
(4) 30
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