Hana sold 4/7 of her stamp collection for $28. How much would she have earned from selling the entire collection?

Hana sold 4/7 of her stamp collection for $28. How much would she have earned from selling the entire collection?

Hana sold 4/7 of her collection for $28, so 1/7 of her collection represents: 28/4 = $

<<28/4=7>>7. And as a result, the entire collection represents: 7 * 7 = $<<7*7=49>>49. #### 49 Mr. Finnegan has 3 tanks with a capacity of 7000 gallons, 5000 gallons, and 3000 gallons, respectively. If he fills the first tank up to 3/4 full, the second tank with water up to 4/5 of its capacity, and the third tank up to half of its capacity, how many gallons in total are in the tanks? The capacity of the first tank is 7000 gallons, and if it is filled up to 3/4 full, it carries 3/4*7000 = 5250 gallons. When the second tank is filled up to 4/5 of its capacity, it carries 4/5*5000 = <<4/5*5000=4000>>4000 gallons. The total amount of water in the first two tanks is 5250+4000 = <<5250+4000=9250>>9250 gallons. If Mr. Finnegan fills the third tank with water up to half its capacity, the tank fills up with 1/2*3000 = <<1500=1500>>1500 gallons. In total, the three tanks have 9350+1500 = <<9350+1500=10850>>10850 gallons of water. #### 10850 In ancient China, soldiers positioned in beacon towers along the Great Wall would send smoke signals to warn of impending attacks. Since the towers were located at 5 kilometer intervals, they could send a signal the length of the Great Wall. If the Great wall was 7300 kilometers long, and every tower had two soldiers, what was the combined number of soldiers in beacon towers on the Great Wall? If there were beacon towers every 5 kilometers along the 7300 kilometer length of the Great Wall, then there were 7300/5=<<7300/5=1460>>1460 beacon towers. If every tower had two soldiers, then there were a total of 1460*2=<<1460*2=2920>>2920 soldiers in beacon towers along the Great Wall. #### 2920 James trains for the Olympics. He trains twice a day for 4 hours each time for all but 2 days per week. How many hours does he train a year? He trains 4*2=<<4*2=8>>8 hours per day He trains 7-2=<<7-2=5>>5 days So he trains 8*5=<<8*5=40>>40 hour per week That means he trains 40*52=$<<40*52=2080>>2080 #### 2080 Tom charges a fee of $100 a day to search for an item for the first 5 days and then $60 per day for every day after that. How much did it cost for him to look for an item for 10 days? The first 5 days cost 5*100=$<<5*100=500>>500 He gets 10-5=<<10-5=5>>5 days on discount He paid 5*60=$<<5*60=300>>300 at the discounted rate So in total he pays 500+300=$<<500+300=800>>800 #### 800 Agatha has $60 to spend on a new bike. She spends $15 on the frame, and $25 on the front wheel. What does she have left, in dollars, to spend on a seat and handlebar tape? Agatha spends 15+25=<<15+25=40>>40 dollars. Agatha has 60-40=<<60-40=20>>20 dollars left. #### 20 In today's field day challenge, the 4th graders were competing against the 5th graders. Each grade had 2 different classes. The first 4th grade class had 12 girls and 13 boys. The second 4th grade class had 15 girls and 11 boys. The first 5th grade class had 9 girls and 13 boys while the second 5th grade class had 10 girls and 11 boys. In total, how many more boys were competing than girls? When you add up all the girls from all 4 classes, you had 12+15+9+10= <<12+15+9+10=46>>46 girls When you add up all the boys from all 4 classes, you had 13+11+13+11 = <<13+11+13+11=48>>48 boys There are 48 boys and 36 girls so 48-46 = 2 more boys #### 2 The school store had a sale on pencils. Ten students bought pencils. The first two students bought 2 pencils each. The next six students bought three pencils each and the last two students only bought one pencil each. How many pencils were sold? The first students bought 2*2=<<2*2=4>>4 pencils The next 6 students bought 6*3=<<6*3=18>>18 pencils The last two students bought 1+1=<<1+1=2>>2 pencils In total the store sold 4+18+2=<<4+18+2=24>>24 pencils #### 24 A storm dropped 5 inches of rain in the first thirty minutes. In the next 30 minutes, the hurricane dropped half that amount of rain. It then dropped 1/2 inch of rain for the next hour. What was the average rainfall total for the duration of the storm? The storm dropped 5 inches then half that amount so 5/2 = <<5/2=2.5>>2.5 inches The next hour the storm dropped 1/2 inch of rain for 1 hour so 1*.5 = <<1*.5=.5>>.5 inches All total the storm dropped 5 inches + 2.5 inches + .5 inch for = <<5+2.5+.5=8>>8 inches It rained for 2 hours total so 8/2 = <<8/2=4>>4 inches of rain per hour #### 4 Bill is hoarding toilet paper in fear of another pandemic. Bill goes to the bathroom three times a day and uses 5 squares of toilet paper each time. If Bill has 1000 rolls of toilet paper and each roll has 300 squares of toilet paper, how many days will his toilet paper supply last? First find the total number of squares Bill's hoard has: 1000 rolls * 300 squares/roll = <<1000*300=300000>>300000 squares Then find the number of squares Bill uses each day: 5 squares/time * 3 times/day = <<5*3=15>>15 squares/day Now divide the total number of squares by the number of squares Bill uses each day to find how many days his hoard will last: 300000 squares / 15 squares/day = <<300000/15=20000>>20000 days #### 20000