Level 3
Mary visited a bakery where cheese tarts are sold in packages of 5 or 10. Packages of 5 are sold at $6.50 each and packages of 10 are sold at $12. What was the most number of cheese tarts could Mary buy with $285?

Level 3
Yoshi prepared some fruit punch for his party. For the fruit punch, he put in 1.23 ℓ of syrup and 4 times as much water as syrup. He then poured the fruit punch equally into 8 glasses. How much fruit punch were there in each glass? Round off your answer to 2 decimal places.

Level 3
Jane mixes 2.4 ℓ of rose syrup with twice as much milk. She then pours the mixture equally into 9 cups. How much mixture will each cup contain?

Level 3
Charlie bought $642 worth of staplers and pens. He bought thrice as many pens as staplers. He spent $334 more on pens than on staplers. Each stapler cost $1.60 more than each pen. Find the price of a stapler.

Level 3
Oscar Mobile Company has a few mobile phone service plans. Plan A offers 270 SMS and 90 minutes of talk time for $25.20. Plan B offers 370 SMS and 190 minutes of talk time for $35.20. Oscar Mobile Company is also going to launch Plan C which offers 170 SMS and 260 minutes of talk time. How much should Oscar Mobile Company charge for Plan C if the cost per SMS and the cost per minute of talk time do not vary across the three plans?