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Brain Teasers Multiplying Mice Marco’s Uncle Oscar gave him 2 mice, which he named Whiskers and Oscar. But Marco discovered that he made a big mistake. Oscar should have been named Oscarella. She just had 8 babies — 4 males and 4 females! “Ten mice aren’t so many,” said Marco to his mother. “And they’re cute.” “Yes,” said his mother, “but these cute baby mice can breed when they are 6 weeks old. The babies are born after 3 weeks of pregnancy.” If each female mouse has only 1 litter and all the litters have 8 babies, half males and half females, how many mice will Marco have in 18 weeks? Marco’s Mice Marco’s Uncle Oscar gave him a pair of piebald mice for his birthday. Marco named one mouse Whiskers and the other one Oscar after his favorite uncle. Now Marco has to buy supplies for his mice. He wants to buy a cage, an exercise wheel, a water bottle, one bag of wood shavings, and 12 ounces of Mouse Chow. At the Fin ’n’ Fur pet store, he found a nice big cage for $29.90, a water bottle for $4.50, an exercise wheel for $6.00, bags of wood shavings priced at 3 for $13.95, and 12 ounces of Mouse Chow at $0.56 an ounce. Luckily, the cage, water bottle, and exercise wheel are on sale at 10% off. The store also has a Pet Starter Kit that includes a cage with a built-in wheel, a water bottle, a bag of wood shavings, and 12 ounces of Mouse Chow, all for $44.95. A 5% sales tax applies to all non-food items, including the complete Pet Starter Kit. The tax is applied after a sale price is determined. Which collection of supplies is the better deal: purchasing each item separately or purchasing the Pet Starter Kit? Computer Shipments Nell Computers wants to hire Overnite Delivery Service to truck computers from the warehouse to stores. Overnite has 2 trucks — 1 large and 1 small. The large truck is twice as high, twice as wide, and twice as long as the small one. Overnite has decided to charge $500 per shipment for each delivery made with a fully loaded small truck. Assuming that charges are based on each truck’s volume, what should Overnite charge for each delivery made with a fully loaded large truck?
Sixth Grade Math Class!! Cecil County Public Schools 200 E. Cecil Ave, North East MD 21901 |
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