A clock strikes 6 times in 5 seconds. Assuming the strikes are evenly spaced, how many seconds does it take for the clock to strike 12 times?
11 seconds
6 strikes mean there are 5 intervals between them, taking 5 seconds, so each interval is 1 second. 12 strikes means 11 intervals, which takes 11 seconds.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Hard. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
More math riddles
Add my age to my twin's age, then double the sum. Now subtract my age. You are left with 34. How old am I?
Four consecutive integers are added together to produce a sum of 154. What is the value of the smallest integer in this group?
Ana has 10 butterflies. Ava has twice as many. How many butterflies do they have together?
There are 21 seeds in a box and 9 are taken out. How many seeds are left?
A merchant has a 40-pound block of weight and a scale. What is the minimum number of pieces he can break the block into to be able to weigh any whole pound amount from 1 to 40 using a balance scale?
Choose any convex polyhedron you like. Count its total faces and vertices, add them together, and then subtract its total number of edges. What invariant integer will your calculation always yield?