An NGO contracted a construction company to build 2000 houses within one year. In the first half of the year, they built the first 3/5 units of the contracted number. Due to unavoidable circumstances, the company could only build an additional 300 units by October. How many units remain from the contracted number that the company is supposed to build?

In the first half of the year, the company constructed 3/5*2000 =

<<3/5*2000=1200>>1200 units. The number of units remaining to be built after the company built 1200 units in the first half of the year is 2000-1200 = <<2000-1200=800>>800 By October, the company built an additional 300 units, thus remaining with 800-300 = <<800-300=500>>500 units to be built. #### 500 Out of the 300 comic books in a comic store, 30% are liked by females, males like 120, and both genders don't like the rest. What percentage of the comic books are disliked by both males and females? The number of comic books that females like is 30/100*300=<<30/100*300=90>>90 books Together, both males and females like 90+120=<<90+120=210>>210 comic books. The number of comic books that are disliked by both males and females is 300-210=<<300-210=90>>90 The percentage of books that are disliked by both genders is 90/300*100=<<90/300*100=30>>30% #### 30 Seven parrots and some crows are perched on a tree branch. There was a noise and the same number of parrots and crows flew away. If only 2 parrots and 1 crow are left on the tree branch now, how many birds were perched on the branch to begin with? The number of parrots that flew away after the noise is 7-2 = <<7-2=5>>5 The same number of crows (5) flew away leaving 1 crow so there were 5+1 = <<5+1=6>>6 crows to begin with The total number of crows and parrots was 7+6 = <<7+6=13>>13 #### 13 A set of 7 spoons costs $21. If each spoon would be sold separately, how much would 5 spoons cost? A set of 7 spoons costs $21, so one spoon from the set costs 21 / 7 = $<<21/7=3>>3. So if sold separately, 5 spoons would cost 5 * 3 = $<<5*3=15>>15. #### 15 The Tigers played 56 home games this year. They had 12 losses and half as many ties. How many games did they win? The Tigers had 12 / 2 = <<12/2=6>>6 ties. The Tigers had 56 - (12 + 6) = <<56-(12+6)=38>>38 wins. #### 38 Mark realizes that a lot of the friends on his friends list are people he doesn't talk to anymore. He keeps 40% of his friends list and then contacts the rest. Of those only 50% respond. He removes everyone who did not respond. If he had 100 friends how many does he have left after the removal? He contacted 1-.4=<<1-.4=.6>>.6 of his friends So he contacted 100*.6=<<100*.6=60>>60 people So he removes 60/2=<<60/2=30>>30 people So he has 100-30=<<100-30=70>>70 friends left #### 70 Two siblings, Eman and Frank, agreed to buy a new computer table, computer chair, and a joystick. The computer table costs $140, the computer chair costs $100, and the joystick costs $20. Eman agreed to pay for the computer chair while Frank agreed to pay for the computer table. Then Frank agreed to pay 1/4 of the price of the joystick and the rest will be paid by Eman. How much more money will Frank spend than Eman? Frank will pay $20 x 1/4 = $<<20*1/4=5>>5 for the joystick. Eman will pay $20 - $5 = $<<20-5=15>>15 for the joystick. So, Frank will pay a total of $140 + $5 = $<<140+5=145>>145. While Eman will pay a total of $100 + $15 = $<<100+15=115>>115. Therefore, Frank will spend $145 - $115 = $<<145-115=30>>30 more than Eman. #### 30 On a mall-wide sale, Andre bought a $1350 treadmill for a 30% discount and 2 pieces of 45-pound plates for $50 each. How much did Andre pay for the treadmill and plates? Andre had $1350 x 30/100 = $<<1350*30/100=405>>405 discount for the treadmill. So, a treadmill cost $1350 - $405 = $<<1350-405=945>>945. Two 45-pound plates cost $50 x 2 = $100. So, Andre paid a total of $945 + $100 = $<<945+100=1045>>1045. #### 1045 One batch of cookies requires 4 cups of flour and 1.5 cups of sugar. How many cups of flour and sugar combined would be needed for 8 batches? Flour + sugar = 4 + 1.5 = <<4+1.5=5.5>>5.5 cups 8 batches = 5.5 * 8 = <<8*5.5=44>>44 cups There would be 44 cups of flour and sugar combined for 8 batches of cookies. #### 44 Gilbert grows herbs in his yard to use in his cooking. At the beginning of the spring, he planted three basil bushes, a parsley plant, and two kinds of mint. Halfway through spring, one of the basil plants dropped seeds from a flower and made an extra basil plant grow. However, a rabbit came by the garden near the end of spring and ate all the mint. How many herb plants did Gilbert have when spring ended? Gilbert planted 3 + 1 + 2 = <<3+1+2=6>>6 herb plants. He gained a basil plant when one of the basil plants seeded a new plant, so he had 6 + 1 = <<6+1=7>>7 plants. The rabbit ate both mint plants, so Gilbert had 7 - 2 = <<7-2=5>>5 herb plants when spring ended. #### 5