Brenda bakes 20 cakes a day. She does this for 9 days and then sells half of the cakes. How many cakes are left with Brenda?

After 9 days, Brenda bakes 20 * 9 =

<<20*9=180>>180 cakes. After she sells half of them, the remaining will be 180 / 2 = <<180/2=90>>90 cakes. #### 90 There are 24 marbles in a jar. Half are blue. There are 6 red marbles. The rest of the marbles are orange. How many orange marbles are there? There are 24/2 = <<24/2=12>>12 blue marbles. Blue and red marbles make up 12 + 6 = <<12+6=18>>18 of the 24 marbles. Thus, there are 24-18=<<24-18=6>>6 orange marbles. #### 6 Alice made 52 friendship bracelets over spring break to sell at school. It only cost her $3.00 in materials to make these bracelets. During the break, she gave 8 of her bracelets away. Back at school, she sells all of the remaining bracelets at $0.25 each. How much profit did she make (money earned after paying initial costs) on the sale of her bracelets? She made 52 bracelets but gave 8 away so she had 50-8 = <<52-8=44>>44 bracelets left. She sold 44 bracelets at $0.25 each for a total of 44 * .25 = $<<44*.25=11.00>>11.00 She made $11.00 but she spent $3.00 on the supplies. So her profit would be 11-3 = $<<11-3=8.00>>8.00 #### 8 The tallest building in the world is 100 feet tall. If the second tallest is half that tall, and the third tallest is half as tall as the second, and the fourth is one-fifth as tall as the third, how tall are all 4 buildings put together? If the second tallest building is half as tall as the first one's height of 100 feet, it is 100/2= <<100/2=50>>50 feet tall. If the third tallest building is half as tall as the second one's height of 50 feet, it is 50/2= <<50/2=25>>25 feet tall. If the fourth building is one-fifth as tall as the third one, it is 25/5= <<25/5=5>>5 feet tall. Therefore, all four buildings put together would be 100+50+25+5= <<100+50+25+5=180>>180 feet tall. #### 180 The school is organizing a trip to the museum. 4 buses were hired to take the children and teachers to their destination. The second bus has twice the number of people on it as the first bus. The third bus has 6 fewer people than the second bus. The fourth bus has 9 more people than the first bus. If the first bus has 12 people, how many people are going to the museum in total? The second bus is carrying 12 * 2 = <<12*2=24>>24 people. The third bus has 24 – 6 = <<24-6=18>>18 people. The fourth bus has 12 + 9 = <<12+9=21>>21 people on it. In total, there are 12 + 24 + 18 + 21 = <<12+24+18+21=75>>75 people on the buses. #### 75 A zoo is arranging the layout of its animal enclosures. There are 4 tiger enclosures in a row and behind each of these are 2 zebra enclosures. There are three times as many giraffe enclosures as zebra enclosures scattered around the zoo. The tiger enclosures hold 4 tigers, the zebra enclosures hold 10 zebras and the giraffe enclosures hold 2 giraffes. If these are the only animals in the zoo, how many animals are in the zoo? There are twice as many zebra enclosures, so there must be 4 tiger enclosures * 2 = <<4*2=8>>8 zebra enclosures. This means there are 8 zebra enclosures * 3 = <<8*3=24>>24 giraffe enclosures. In the tiger enclosures, there are 4 tiger enclosures * 4 = <<4*4=16>>16 tigers. In the zebra enclosures, there are 8 zebra enclosures * 10 zebras = <<8*10=80>>80 zebras. In the giraffe enclosures, there are 24 giraffe enclosures * 2 giraffes = <<24*2=48>>48 giraffes. So in total, there are 16 tigers + 80 zebras + 48 giraffes = <<16+80+48=144>>144 animals in the zoo. #### 144 Every morning Harry takes 15 minutes to buy coffee and a bagel and twice that long to read the paper and eat before going in to work. How long does Harry's morning routine take? First find the time Harry spends eating: 15 minutes * 2 = <<15*2=30>>30 minutes Then add the time he spends buying breakfast to find the total time: 30 minutes + 15 minutes = <<30+15=45>>45 minutes #### 45 James wants to build a 16-foot by 20-foot quilt. He uses patches that are each 4 square feet. The first 10 patches cost $10 each and then each patch after that cost half as much. How much do the patches for the quilt cost? The patch is 16*20=<<16*20=320>>320 square feet So he needs 320/4=<<320/4=80>>80 patches The first 10 patches cost 10*10=$<<10*10=100>>100 He gets a discount on the next 80-10=<<80-10=70>>70 patches They each cost 10/2=$<<10/2=5>>5 So in total they cost 70*5=$<<70*5=350>>350 That means in total he paid 100+350=$<<100+350=450>>450 #### 450 1 chocolate bar costs $1.50 and can be broken into 3 sections to make 3 s'mores. Ron is hosting a boy scout camp out in his backyard for 15 scouts. He wants to make sure that there are enough chocolate bars for everyone to have 2 s'mores each. How much will he spend on chocolate bars? There are 15 scouts and Ron wants to make sure they each get 2 s'mores a piece, for a total of 15*2 = <<15*2=30>>30 s'mores 1 chocolate bar can make 3 s'mores and he wants to have enough for 30 s'mores, so he needs 30/3 = <<10=10>>10 chocolate bars Each chocolate bar costs $1.50 and he needs 10, for a total of 1.5*10 = $<<1.5*10=15.00>>15.00 #### 15 Vicky has an excellent internet connection. She can download up to 50 MB/second. She has to download a new program to finish a college assignment. The program’s size is 360GB. If the internet connection is at maximum speed, how many hours does she have to wait until the program is fully downloaded? (There are 1000 MB per GB.) We have to know how many MB are 360GB, 360GB x 1,000MB/1GB = <<360000=360000>>360,000 MB The total seconds downloading will be 360,000MB ÷ 50MB/second = <<360000/50=7200>>7,200 seconds So she has to wait 7,200 seconds ÷ 3,600 seconds/1 hour = <<7200/3600=2>>2 hours #### 2