In a parking lot, there are cars and motorcycles. Each car has 5 wheels (including one spare) and each motorcycle has 2 wheels. There are 19 cars in the parking lot. Altogether all vehicles have 117 wheels. How many motorcycles are at the parking lot?

There are 19 cars at the lot, so there are 5 * 19 =

<<19*5=95>>95 wheels of cars. So there are 117 - 95 = <<117-95=22>>22 wheels of motorcycles in the parking lot. Each motorcycle has 2 wheels, so that leaves us with 22 / 2 = <<22/2=11>>11 motorcycles in the parking lot. #### 11 Dolly wants to ride the Ferris wheel twice, the roller coaster three times, and the log ride seven times. The Ferris wheel costs 2 tickets, the roller coaster costs 5 tickets and the log ride costs 1 ticket. Dolly has 20 tickets. How many more tickets should Dolly buy? It costs 2 rides x 2 tickets/ride = <<2*2=4>>4 tickets to ride the Ferris wheel twice. It costs 3 rides x 5 tickets/ride = <<3*5=15>>15 tickets to ride the roller coaster three times. It costs 7 rides x 1 ticket/ride = <<7*1=7>>7 tickets to ride the roller coaster seven times. In total Dolly needs 4 tickets + 15 tickets + 7 tickets = <<4+15+7=26>>26 tickets. Dolly needs to buy 26 tickets - 20 tickets = <<26-20=6>>6 more tickets. #### 6 Rachel solved 5 math problems each minute for 12 minutes before bed, but she didn't finish all of them. The next day, she finished the last 16 problems at lunch. How many math problems did she do in all? Before going to bed, Rachel did a total of 5 × 12 = <<5*12=60>>60 problems. In total Rachel did 60 + 16 = <<60+16=76>>76 maths problems. #### 76 Greg is riding his bike around town and notices that each block he rides, his wheels rotate 200 times. He's now on a a trail and wants to make sure he rides at least 8 blocks. His wheels have already rotated 600 times, how many more times do they need to rotate to reach his goal? They need to rotate 1,600 times because 8 x 200 = <<8*200=1600>>1,600 They need to rotate 1,000 more times because 1,600 - 600 = <<1600-600=1000>>1,000 #### 1000 Ethyl bought Lucy two new dolls for her doll collection. This increased the doll collection by 25%. After the addition of the two new dolls, how many dolls are in Lucy's collection? Let's let "x" be the original number of dolls in Lucy's doll collection. Then, 2 dolls equals an increase of 25%, and this can be written as x*0.25=<<2=2>>2. Solving for x we get x=2/0.25=<<2/0.25=8>>8 dolls in Lucy's original collection. After the gift of two new dolls, Lucy's collection contains 8+2=<<8+2=10>>10 dolls. #### 10 A mosquito sucks 20 drops of blood every time it feeds on someone. If there are 5000 drops per liter and you have to lose 3 liters of blood to die, how many mosquitoes would have to feed on you to kill you? First find the total number of liters a mosquito sucks in one feeding: 20 drops / 5000 drops/liter = <<20/5000=.004>>.004 L/feeding Then divide the lethal amount of blood by the amount of blood one mosquito can drain: 3 L / .004 L/feeding = <<3/.004=750>>750 feedings #### 750 Chris wanted to buy a new video game that costs $60 as well as an assortment of candy that costs $5. To earn the money, he agreed to babysit his little sister for $8 per hour. If he works 9 hours, how much money will be left over after he makes his purchases? He wants to buy a $60 game and $5 of candy so 60 + 5 = $<<60+5=65>>65 He will make $8 per hour of babysitting and will work 9 hours so 8 * 9 = $<<8*9=72>>72 He made $72 and spent $65 so 72-65 = $<<72-65=7>>7 left over #### 7 GiGi took out a big bowl of mushrooms from the refrigerator. She cut each mushroom into 4 pieces. Her twins, Kenny and Karla sprinkled mushrooms on their pizzas and baked them in the oven. Kenny grabbed a handful and sprinkled 38 mushroom pieces on his pizza. Karla scooped them up with both hands and sprinkled 42 mushroom pieces on her pizza. On the cutting board, were 8 pieces of mushrooms remaining. How many mushrooms did GiGi cut up at the beginning? Kenny used 38 / 4 = <<38/4=9.5>>9.5 mushrooms on his pizza. Karla used 42 / 4 = <<42/4=10.5>>10.5 mushrooms on her pizza. Together, the twins used 9.5 + 10.5 = <<9.5+10.5=20>>20 mushrooms. There are 8 / 4 = <<8/4=2>>2 mushrooms left on the cutting board. GiGi cut up 20 + 2 = <<20+2=22>>22 mushrooms at the beginning. #### 22 Jason and Jeremy want to paint their wall white and agreed to split the cost of the paint. A gallon of paint costs $45 and can cover up to 400 square feet. How much will each of them contribute to the cost of the paint if their walls have a total area of 1600 square feet and will need a second coat? They need 1600 square feet / 400 square feet/gallon = <<1600/400=4>>4 gallons of paint for their walls. Since they will do a second coating, then they would need 4 gallons x 2 = <<4*2=8>>8 gallons in all. Eight gallons of paint will cost $45/gallon x 8 gallons = $<<45*8=360>>360. Thus, Jason and Jeremy will each contribute $360/2 = $<<360/2=180>>180. #### 180 For breakfast, Anna bought a bagel for $0.95 and a glass of orange juice for $0.85. At lunch, Anna spent $4.65 on a sandwich and $1.15 on a carton of milk. How much more money did Anna spend on lunch than on breakfast? The total cost of breakfast is $0.95 + $0.85 = $<<0.95+0.85=1.80>>1.80. The total cost of lunch is $4.65 + $1.15 = $<<4.65+1.15=5.80>>5.80. Anna spent $5.80 − $1.80 = $4 more on lunch than breakfast. #### 4