exam Maths Puzzle Numerical Ability

A car travels at 40 km/h 30 minutes and 60 km/h for 15 minutes. How far does it travel in this time?

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You need to borrow $5,000 for 2.33 years. Originally, the bank offers a 6.5% rate. Then, after some negotiation, they are willing to drop the rate to 5.5%. What savings in interes a)Mary invested $600 at the Royal Bank at an interest rate of 3.6% per year.How much money will she have after 12 years?
b)The half-life of radium is 1400 years. If there was 800 grams of radium, how much will remain after 5000 years?