David takes 30 seconds to climb from the first floor to the third floor. How many seconds will he take to climb from the third floor to the sixth floor?
Three two-sided cards show the symbols and numbers in the source excerpt. After some cards are flipped and rearranged, what number is on the other side of the card with the plus symbol?
Tom makes a rectangle with 10 gumdrops and 10 toothpicks. He then makes another rectangle with 32 gumdrops, whose long side has twice as many gumdrops as its short side. How many gumdrops are on a short side?