Andy is running late. School starts at 8:00 AM and it normally takes him 30 minutes to get there, but today he had to stop for 3 minutes each at 4 red lights and wait 10 minutes to get past construction. If he left his house at 7:15, how many minutes late will he be?

First find how many minute Andy had to get to school when he left his house: 8:00 AM - 7:15 AM = 45 minutes

Then find the total time he spent waiting at red lights: 3 minutes/light * 4 lights =

<<3*4=12>>12 minutes Now add the normal travel time, red light time, and construction wait time to find Andy's total travel time: 30 minutes + 12 minutes + 10 minutes = <<30+12+10=52>>52 minutes Now subtract the amount of time Andy had when he left his house from that number to find how many minute late he is: 52 minutes - 45 minutes = <<52-45=7>>7 minutes #### 7 Jack will have ten times more handball trophies than Michael has right now in three years. If Michael has 30 trophies right now, and the number of his trophies increases by 100 in three years, what's the total number of trophies they'll have altogether after three years? In three years, Michael will have 30+100 = <<30+100=130>>130 trophies. If Michael has 30 trophies now, Jack will have 10*30 = <<30*10=300>>300 in three years. Altogether, Jack and Michael will have 300+130 = <<300+130=430>>430 handball trophies in three years. #### 430 Colbert is building a treehouse out of wooden planks. The treehouse needs 200 wooden planks. A quarter of these planks come from Colbert’s storage, half of these planks come from Colbert’s parents, 20 planks come from Colbert’s friends and he buys the rest from the store. How many planks of wood does he need to buy from the store to finish his treehouse? In Colbert’s storage, there are 200 wooden planks / 4 = <<200/4=50>>50 wooden planks. From his parents, there are 200 wooden planks / 2 = <<200/2=100>>100 wooden planks. So in total, Colbert has not had to buy 50 wooden planks from storage + 100 wooden planks from his parents + 20 wooden planks from his friends = <<50+100+20=170>>170 wooden planks. He therefore still needs to buy 200 needed wooden planks – 170 owned wooden planks = <<200-170=30>>30 wooden planks. #### 30 Audrey was asleep for 10 hours last night and dreamed for 2/5 of the time. How much of the night was she not dreaming? If Audrey was asleep for 10 hours last night and dreamed for 2/5 of the time, she dreamed for 2/5*10 = <<10*2/5=4>>4 hours. The total time Audrey slept without dreaming is 10-4 = <<10-4=6>>6 hours. #### 6 Martha has 11 butterflies in her collection. She has twice as many blue butterflies as yellow butterflies. The rest of her butterflies are black. If Martha has 5 black butterflies, how many blue butterflies does she have? Martha has 11-5=<<11-5=6>>6 blue and yellow butterflies. Martha has 6/3=<<6/3=2>>2 yellow butterflies. Martha has 2*2=<<2*2=4>>4 blue butterflies. #### 4 Henry wants to buy a t-shirt, a pair of jeans and a pair of socks. The jeans are twice the price of the t-shirt, and the t-shirt is $10 more expensive than the socks. The socks cost $5. How much does Henry need to pay for the pair of jeans? The t-shirt costs $10 more than the socks, so it costs $5 + $10 = $15. The jeans are twice the price of the shirt, so they cost 2 * $15 = $<<2*15=30>>30. #### 30 Paula wants to ride the go-karts 1 time and the bumper cars 4 times. It costs 4 tickets to ride the go-karts and 5 tickets to ride the bumper cars. How many tickets does Paula need? Paula wants to go on the go-kart 1 time and the bumper cars 4 times. The number of tickets needed for the go-karts is 1 × 4 = <<1*4=4>>4. The number of tickets needed for the bumper cars is 4 × 5 = <<4*5=20>>20. Paula needs 4 + 20 = <<4+20=24>>24 tickets. #### 24 James rents his car out for $20 an hour. He rents it for 8 hours a day 4 days a week. How much does he make a week? He rents it out for 8*4=<<8*4=32>>32 hours That means he makes 32*20=$<<32*20=640>>640 #### 640 Oula and Tona work for a delivery service company, supplying different parts of their state with milk products. They are paid $100 for each delivery made in a day. In a particular month, Oula made 96 deliveries while Tona made 3/4 times as many deliveries as Oula. Calculate their difference in pay that month. Oula's earnings for that month are 96* $100 = $<<96*100=9600>>9600 Tona made 3/4*96 = <<3/4*96=72>>72 deliveries that month. Tona's total earnings for that month are 72*$100 = $<<72*100=7200>>7200 Their difference in pay is $9600-$7200 = $<<9600-7200=2400>>2400 #### 2400 Rob has some baseball cards, and a few are doubles. One third of Rob's cards are doubles, and Jess has 5 times as many doubles as Rob. If Jess has 40 doubles baseball cards, how many baseball cards does Rob have? Rob has 40/5=<<40/5=8>>8 doubles baseball cards. Rob has 8*3=<<8*3=24>>24 baseball cards. #### 24