A community is building a metal fence. Each fence panel is made of 3 metal sheets, and 2 metal beams. The fence is made of 10 fence panels. If each sheet is made of 10 metal rods and each metal beam is made of 4 metal rods, how many metal rods does the community need for the fence?
Let's think: In each panel, the metal sheets use 3 metal sheets * 10 metal rods = 30 metal rods. In each panel, the metal beams use 2 metal beams * 4 metal rods = 8 metal rods. So each panel uses 30 + 8 = 38 metal rods. The entire fence therefore needs 38 metal rods * 10 fence panels = 380 metal rods.. The answer is: 380.

Paul eats a lot when he studies. He loves sandwiches and eats them at the same rate every three days. He eats 2 sandwiches the first day, then doubles that number of sandwiches for the second day. On the third day, he doubles the number of sandwiches he ate on the second day. How many sandwiches would Paul eat if he studied 6 days in a row?
Let's think: Paul doubles the amount that he ate on the second day, so eats 2 x 2 = 4 sandwiches. For the third day, he doubles the number of sandwiches he ate on the second day, so eats 2 x 2 x 2 = 8 sandwiches. To get the total amount of sandwiches he ate over three days it's necessary to add up the amount he ate each day: 2 + 4 + 8 = 14 sandwiches. Since he eats 14 sandwiches every 3 days, then in 6 days he would eat 14 x 2 = 28 sandwiches in total.. The answer is: 28.

Adah practiced the cello for a total of 7.5 hours last week. He practiced for 86 minutes on each of 2 days. How many minutes in total did he practice on the other days?
Let's think: 7.5 hours = 450 minutes. Two days = 2 * 86 = 172 minutes. 450 - 172 = 278 minutes. Adah practiced a total of 278 minutes on the other days.. The answer is: 278.

Carla needs to bring water to her animals. Each horse needs twice as much water as a pig, and the chickens drink from one tank that needs 30 gallons. How many gallons of water does Carla need to bring if she has 8 pigs and 10 horses and each pig needs 3 gallons of water?
Let's think:
First figure out how much water all the pigs need: 8 pigs * 3 gallons / pig = 24 gallons. Then figure out how much water one horse needs by multiplying a pig's needs by 2: 3 gallons * 2 = 6 gallons. Now find how much water all the horses need: 10 horses * 6 gallons / horse = 60 gallons. Finally, add up all the animals' water needs: 24 gallons + 60 gallons + 30 gallons = 114 gallons.. The answer is: 114.