Marvellous+Mathemagicians

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media type="custom" key="10231963" media type="custom" key="10233161" Answer the questions on your own page. Write the date, the heading **Marvellous Mathemagicians** and the question. Then write your answer and a short explanation of what you did to solve the problem.

**22nd August 2011** **LEVEL 1 - EASY** Khaled, Anthony and Isaia all wanted to go to the movies. Tickets cost $12.50 each. How much change would they have from $50 after buying their tickets? Would they have enough money left to buy a popcorn/drink combo each at $4.95 each?

**LEVEL 2 - MEDIUM** The world's tallest building is the 828m tall Burj Khalida in Dubai in the United Arab Emirates. If we wanted to build a structure that was 25% taller, how tall would we need to make it?

**LEVEL 3 - HARD** If an eleven year old's average heart beat was 90 beats per minute, how many times would it beat in one hour? 1 day? 1 year?

**LEVEL 4 - VERY HARD** China's current population is a whopping 1 319 175 336 people! If it continues to grow at a rate of 5% per annum, what will the population be in 20 years time?

Australia's current population is only 22 683 048 people. How many times bigger is China's population than Australia's?

**LEVEL 4 - MIND BOGGLING! ** If I was born at 6am on 14th July 1974, exactly how many days have I lived? How many hours is this? How many minutes?  __**Remember**__**:** the answer depends on when you do the problem so make sure you write the date!!