How many steps are required to climb a 100 cm tree?Ĩ. Each forward step is 30 cm and each backward step is 40 cm. He takes 3 steps forward and slips back 2 steps downward. Riddle: A monkey is trying to climb a coconut tree. That is, the second digit must be twice the first.
If 10a + b = 7(a + b), then 10a + b = 7a + 7b, and so 3a = 6b, or, more simply, a = 2b. The two-digit number ab stands for 10a + b since the first digit represents 10s and the second represents units. Riddle: What is the smallest whole number that is equal to seven times the sum of its digits?Īnswer: 21. He purchased three cookies that cost $1.50 each, five newspapers that each cost $0.50, five flowers for $1.25 each, and used the remainder of the cash on a pair of sunglasses. Since one of the two options includes older twins (1 + 6 + 6 = 13) and the other includes young twins (2 + 2 + 9 = 13), the daughters must be 2, 2, and 9.ĥ. The third hint indicates there is an “oldest” daughter. When he realizes the sum is 13, the answer is one of two possibilities. Why would he need to go back to get the last hint after seeing the number on the house next door?Īnswer: After the first hint, there are several different options. So she says she’ll give him one last hint which is that her oldest of the 3 plays piano. He goes next door and looks at the house number (13) and says this is still not enough information. If you add up the children’s ages, the sum is the number on the house next door. If you multiply the 3 children’s ages, you get 36. A woman answers, and he asks her how many children she has and how old they are. Riddle: An insurance salesman walks up to a house and knocks on the door. What is my present age?Īnswer: When you calculate the difference between the ages, you can see that it is 23 years. Riddle: When my dad was 31, I was just 8 years old. Hence four different numbers can be made.ģ.
How many different ten-digit numbers can I type using just the 0-9 keys once each, and moving from one keypress to the next using the knight’s move in chess? (In chess, the knight move in an L-shape-one square up and two across, two squares down and one across, two squares up and one across, and other like combinations.)Īnswer: You can form the numbers 50349276167294. Riddle: I have a calculator that can display ten digits.
If there are more large boxes than small boxes, how many cartons did he ship?Īnswer: 11 cartons total: 7 cartons of large boxes (7 * 8 = 56 boxes), 4 cartons of small boxes (4 * 10 = 40 boxes).Ģ. In one shipment, he sent a total of 96 boxes. Riddle: A merchant can place 8 large boxes or 10 small boxes into each carton for shipping.
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