At his craftwork store, Howard has a collection of 70 wooden bowls where he rewards two to his customers for every 10 they buy. If he had 20 customers that day, half of whom bought 20 bowls each, calculate the number of bowls remaining in the rewards collection.

Half of the 20 customers, which is 1/2*20=10 bought 20 bowls each, receiving 2 for every 10.

The total number of reward bowls each customer who bought 20 bowls received is 2+2=

<<2+2=4>>4 If 10 customers bought 20 bowls, Howard gave away 4*10=<<4*10=40>>40 bowls as rewards. The total number of reward bowls that remained is 70-40=<<70-40=30>>30 #### 30 Jackie walks 2 miles each day while Jessie walks 1.5 miles each day. How many more miles, in all, does Jackie walk than Jessie walk in 6 days? Jackie walks 2 - 1.5 = <<2-1.5=0.5>>0.5 miles more each day than Jessie. So in 6 days, Jakie walks 0.5 x 6 = <<0.5*6=3>>3 miles more than Jessie. #### 3 Harper needs to buy teacher appreciation gifts for her children’s teachers. Her son has 3 different teachers and her daughter has 4. If she spent $70 on gifts, how much did each gift cost? Her son has 3 teachers and her daughter has 4, so together they have 3+4 = <<3+4=7>>7 teachers Harper has already spent $70 on 7 gifts, so she spent $70/7 = $<<70/7=10>>10 per gift #### 10 Jacob's water tank can hold up to 50 liters of water. Jacob collects water from the river and rain to fill his water tank. He can collect 800 milliliters of water from the rain and 1700 milliliters of water from the river every day. How many days does Jacob need to fill up his water tank? Jacob collects 800+1700= <<800+1700=2500>>2500 milliliters of water from the river and rain every day. Since 1 liter is equal to 1000 milliliters, then 50 liters is equal to 50x1000= <<50*1000=50000>>50,000 milliliters of water. Therefore Jacob needs 50,000/2500= <<50000/2500=20>>20 days to fill his water tank. #### 20 Joshua packs 12 bottles in each crate. He has a total of 130 bottles and 10 crates. How many bottles will not be placed in a crate? A total of 12 x 10 = <<12*10=120>>120 bottles will be placed in 10 crates. Therefore, 130 - 120 = <<130-120=10>>10 bottles will not be placed in a crate. #### 10 Carly is making burgers for a neighborhood BBQ. Each burger needs to be cooked for 4 minutes on each side. Carly can fit 5 burgers on the grill at once. If half her 30 guests want 2 burgers and the other half each want 1, how long will it take Carly to cook all the burgers? First find half the number of guests at Carly's party: 30 guests / 2 = <<30/2=15>>15 guests Then multiply that number by 2 for the number of burgers half the guests want: 15 guests * 2 burgers/guest = <<15*2=30>>30 burgers Then add the 15 burgers for the 15 guests who only want 1 to find the total number of burgers: 30 burgers + 15 burgers = 45 burgers Then divide the total number of burgers by the number of burgers Carly can cook at once to find the number of batches she cooks: 45 burgers / 5 burgers/batch = <<45/5=9>>9 batches Then multiply the number of sides per burger by the cooking time per side to find each burger's total cook time: 4 minutes/side * 2 sides = <<4*2=8>>8 minutes Finally, multiply each batch's cook time by the number of batches to find the total cook time: 8 minutes/batch * 9 batches = <<8*9=72>>72 minutes #### 72 Miley bought two cellphones for her parents. Each cellphone costs $800 but, since she is buying two units, she will receive a 5% discount for the total cost. How much did Miley pay? Two cellphones cost $800 x 2 = $<<800*2=1600>>1600. The 5% discount amounts to $1600 x 5/100 = $<<1600*5/100=80>>80. So Miley paid $1600 - $80 = $<<1600-80=1520>>1520. #### 1520 Beth is looking at her book collection and is wondering how many comic books she owns. She has 120 books and 65% are novels. 18 are graphic novels. The rest are comic books. What percentage of comic books does she own? The proportion of graphic novels is .15 because 18 / 120 = <<18/120=.15>>.15 The percentage of graphic novels is 15 because 100 x .15 = <<100*.15=15>>15 The percentage of comic books is 20 because 100 - 65 - 15 = <<100-65-15=20>>20 #### 20 Hadassah took six hours to paint 12 paintings. What would be the total time she's taken to finish all the paintings if she paints 20 more paintings? If it took Hadassah six hours to paint 12 paintings, then she paints 12/6 = <<12/6=2>>2 paintings in an hour. If two paintings take an hour to complete, 20 paintings will take 20/2 = <<20/2=10>>10 hours. The total time she took to finish all the paintings is 10+6 = <<10+6=16>>16 hours. #### 16 Jimmy and Tonya both like collecting matchbooks and stamps. Tonya and Jimmy decide to trade some stamps and matchbooks. They have each decided that one stamp is worth 12 matches. Each matchbook contains 24 matches. If Tonya arrives with 13 stamps, Jimmy has 5 matchbooks, and Jimmy trades all his matchbooks for stamps, how many stamps does Tonya have left? Jimmy has 120 matches because 5 times 24 equals <<5*24=120>>120. Jimmy trades this for 10 stamps because 120 divided by 12 equals <<120/12=10>>10 Tonya has 3 stamps left because 13 minus 10 equals <<13-10=3>>3. #### 3