一个美术生
Two white socks cost 25 cents more than a single brown sock. If two white socks cost 45 cents, how much would you pay for 15 brown socks?
Two white socks cost 25 cents more than a single brown sock, meaning a brown sock is sold at $0.45-$0.25=$0.20
The cost of buying 15 brown socks is 15*$0.20=$
<<15*0.20=3>>3 #### 3 Kim buys 3 pizzas. They are 12 slices each. The pizza cost $72. How much did 5 slices cost? he got 3*12=<<3*12=36>>36 slices So each slice cost 72/36=$<<72/36=2>>2 So 5 slices would cost 5*2=$<<5*2=10>>10 #### 10 Lily had $55 in her account. She spent $7 on a shirt. She then went to another shop and spent thrice as much as she spent on a shirt. How much money is left in Lily's account? After spending money on a shirt, Lily had $55 - $7 = $<<55-7=48>>48 left. She spent $7 x 3 = $<<7*3=21>>21 on another store. Therefore, she only has $48 - $21 = $<<48-21=27>>27 left on her account. #### 27 Georgie needs 3 avocados to make her grandmother's guacamole recipe. If she already had 5 avocados and her sister buys another 4 avocados, how many servings of guacamole can Georgie make? Altogether, Georgie has 5 + 4 = <<5+4=9>>9 avocados. She can make 9/3 = <<9/3=3>>3 servings of guacamole. #### 3 Sabrina gave 10 cookies to her brother. Her mother gave Sabrina half the number of cookies she gave her brother. Then Sabrina gave two-thirds of her cookies to her sister. If Sabrina had 20 cookies at the start, how many cookies are left with her? Sabrina had 20 - 10 = <<20-10=10>>10 cookies left after giving 10 cookies to her brother. Sabrina's mother gave her 10/2 = <<10/2=5>>5 cookies. So, she had 10 + 5 = <<10+5=15>>15 cookies then. She gave 15 x 2/3 = <<15*2/3=10>>10 cookies to her sister. Therefore, she only has 15 - 10 = <<15-10=5>>5 cookies left. #### 5 Isabel has some money in her piggy bank. She spent half the amount and bought a toy. She then spent half of the remaining money and bought her brother a book. If she has $51 left, how much money, in dollars, did she have at first? After buying the toy, Isabel has 51*2=<<51*2=102>>102 dollars left. Isabel had 102*2=<<102*2=204>>204 dollars at first. #### 204 A pool has 48 blue tiles and 32 red tiles. If the pool needs 100 tiles to be completed, how many more tiles are needed? The pool currently has 48+32 = <<48+32=80>>80 tiles. The pool needs 100-80 = <<100-80=20>>20 more tiles to be completed. #### 20 Melanie is making meatballs for dinner. The recipe calls for breadcrumbs. To make the breadcrumbs Melanie is going to tear 2 slices of bread into smaller pieces and then add them to a blender to grind them into fine crumbs. First she tears the bread slices each in half, then tears those halves in half. How many bread pieces is Melanie going to put into the blender? Melanie starts with 1 slice of bread that she tears in half, making 2 halves. She takes both of those halves and tears them each in half, 2 halves x 2 more halves in half = <<2*2=4>>4 pieces per slice of bread. Melanie is using 2 slices of bread x 4 pieces each = <<2*4=8>>8 pieces overall to add to the blender. #### 8 Robi Ney wants to fill a 120-liter tub. He is amused by letting the water run for 1 minute, then closing the water supply for 1 minute, and so on alternating opening and closing the water supply. But the cap at the bottom of the tub is not very airtight and lets 1 liter of water escape per minute. The flow rate of the tap is 12 liters per minute. How long does it take to fill the tub in minutes? In 2 minutes, 12 liters of water flow into the bathtub and 2 liters (2 minutes x 1 liter/minute ) escape. This will leave 12 – 2 = <<12-2=10>>10 liters of water every two minutes We can divide the number of liters by the number of minutes to find the average flow per minute, which is 10 / 2 = <<10/2=5>>5 liters per minute To fill the tub, it will take 120 liters / 5 liters/min = <<120/5=24>>24 min #### 24 There are 3 meatballs on each spaghetti plate. If Theresa's 3 sons each eat two-thirds of the meatballs on their respective plates, how many meatballs are still left on their plates altogether? Total meatballs on the plates 3 x 3 = <<3*3=9>>9. If two-thirds are eaten, one-third remaining on the plates is 9 / 3 = <<9/3=3>>3. #### 3