Beth had 150 students in her 10th-grade class. The following year 30 more students join. In her final year, 15 students left. How many students did Beth have in her class at the end of her final year?

Beth had 150 students her 10th-grade year, and added 30 more the following for a total of 150+30=

<<150+30=180>>180 students In her final year, 15 students left her class, bringing her total to 180-15=165 students #### 165 Harper drinks a 1/2 bottle of mineral water per day. She buys the mineral water by the case at a big box store. They come 24 bottles to a case and are currently on sale for $12.00. If she wants to buy enough cases to last her 240 days, how much will she spend? She drinks 1/2 bottle a day and there are 24 bottles in a case so a case will last 24/.5 = <<24/.5=48>>48 days She needs enough to last her 240 days and 1 case will last her 48 days so she needs 240/48 = <<240/48=5>>5 cases Each case is on sale for $12.00 and she needs 5 cases so that's 12*5 = $<<12*5=60.00>>60.00 #### 60 Estevan has 24 blankets. One-third of the blankets have polka-dots. For his birthday, his mother gives him 2 more polka-dot print blankets. How many polka-dot blankets does Estevan have in total? Before his birthday, Estevan has 24 / 3 = <<24/3=8>>8 polka-dot blankets After his birthday, Estevan has 8 + 2 = <<8+2=10>>10 polka-dot blankets #### 10 Lorenzo put three full cans of thumbtacks into his pocket and went off to work at the corkboard factory. It was Lorenzo's job, as head of quality control, to test every cork board for its ability to hold thumbtacks. He placed one thumbtack from each of the three cans of thumbtacks into every board tested. At the end of the day, he had tested 120 boards and had 30 tacks remaining in each of the three cans. What was the total combined number of thumbtacks from the three full cans? At the end of the day, he had tested 120 boards, each with three tacks, for a total of 3*120=<<120*3=360>>360 tacks He had 30 tacks remaining in each of the three cans, for an additional 3*30=<<3*30=90>>90 thumbs tacks. Therefore, the original total combined number of thumbtacks in the three full cans of thumbtacks was 360+90=<<360+90=450>>450 thumbtacks. #### 450 Janice adds 2 tablespoons of koolaid power and 16 tablespoons of water to a jug. She leaves it out long enough for 4 tablespoons of water to evaporate. Then she quadruples the amount of water in the jug. What percentage of the liquid in the jug is koolaid powder? First find how many tablespoons of water are left after the evaporation: 16 tbs - 4 tbs = <<16-4=12>>12 tbs Then multiply this number by 4 to find how much water is in the jug after Janice refills it: 12 tbs * 4 = <<12*4=48>>48 tbs Now add the 2 tablespoons of koolaid powder to find the total volume of the liquid in the jug: 48 tbs + 2 tbs = <<48+2=50>>50 tbs Now divide the volume of the koolaid powder by the total volume and multiply by 100% to find the percentage of the liquid that's koolaid: 2 tbs / 50 tbs * 100% = 4% #### 4 Ignatius owns 4 bicycles. A friend of his owns different types of cycles, which have three times are many tires as Ignatius's bikes have. He has one unicycle, a tricycle, and the rest are bikes. How many bicycles does the friend own? Ignatius has 8 tires because 2 x 4 = <<2*4=8>>8 His friend has 24 tires because 3 x 8 = <<3*8=24>>24 There are 20 bicycle wheels because 24-1-3 = <<24-1-3=20>>20 He has 10 bicycles because 20 / 2 = <<20/2=10>>10 #### 10 Rory has 30 more jellybeans than her sister Gigi who has 15 jellybeans. Lorelai has already eaten three times the number of jellybeans that both girls have. How many jellybeans has Lorelai eaten? Rory has 30 more jellybeans than Gigi who has 15 so Rory has 30+15 = <<30+15=45>>45 jellybeans Rory has 45 jellybeans and Gigi has 15 so that's 45+15 = <<45+15=60>>60 jellybeans total Lorelai has eaten three times the amount of jellybeans that both girls have so she has eaten 3*60 = <<3*60=180>>180 jellybeans #### 180 Out of the 200 cookies that Javier baked from the recipe he learned online, his wife took 30%, and his daughter took 40 from the remaining cookies. If he ate half of the remaining cookies, how many cookies did they not eat? From the 200 cookies, Javier's wife ate 30/100*200 = <<30/100*200=60>>60 After the wife ate 60 cookies, the number of cookies that remained was 200-60 = <<200-60=140>>140 The daughter also ate 40 cookies leaving 140-40 = <<140-40=100>>100 cookies. If Javier ate half of the remaining cookies, he ate 1/2*100 = 50. The number of cookies that remained is 100-50 = <<100-50=50>>50 #### 50 Jeremy buys 30 watermelons. He eats 3 watermelons per week. Each week he gives 2 to his dad. How many weeks will the watermelons last? Jeremey goes through 3+2=<<3+2=5>>5 watermelons per week. Therefore, the watermelons will last him to 30/5=<<30/5=6>>6 weeks. #### 6 A hot dog stand sells 10 hot dogs every hour, each one selling for $2. How many hours does the stand need to run to make $200 in sales? First, we find out how much in sales the stand makes each hour by multiplying the number of hot dogs sold by the sales price, finding that 2*10=<<2*10=20>>20 dollars in sales each hour. Then we divide the sales goal for the day by the sales per hour, finding that the stand needs to be open for 200/20= <<200/20=10>>10 hours to hit its sales goal. #### 10