If a book has 240 pages and you read 20% of it on Monday, and one-third of the remaining pages on Tuesday, how many unread pages do you have left?
128
On Monday you read 20% of 240 = 48 pages, leaving 240 - 48 = 192 pages. On Tuesday you read 1/3 of 192 = 64 pages. The remaining unread pages are 192 - 64 = 128.
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: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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