# New PDF release: Contemporary Brainteasers

By Terry Stickels

What percentage playing cards do i need to deal earlier than i do know for yes that you've a straight?
If typists can variety pages in mins, what percentage typists will it take to kind 18 pages?
How many days are in five million seconds?
If you're thinking that those are solid questions, this is often the publication for you! Over 200 pleasing puzzles regarding mathematical and mechanical calculations contain demanding situations for your lateral pondering and logical reasoning. whilst your brain's uninterested in being teased, you could seek advice the full ideas.

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Extra info for Contemporary Brainteasers

Sample text

Then there are x + 9 women and we are given that Solving, 2(x + 9) = 5x, 2x + 18 = 5x, 3x = 18, and x = 6. So there were 6 men and 15 women. 17 You would need two each of 1, 3, 9, and 27 ounce weights. You can balance any whole number of ounces between 1 and 40 with these eight weights. 18 The answer is 10. These are the fractions 1/2, 1/3, 1/4, 1/5, 1/6, 1/7, 1/8, 1/9, and 1/10 expressed in decimal form (without the decimal), and rounded off. 1666... 111... 19 If g = 1- then v = f × (1 – g)t, (1 – g)t = v/f, 1– g = , –g = - 1+ , and g = 1- .

200 + 30 + 60 = 290 lbs. 290 lbs. × 2 ft. = 580 ft. lbs. on the left side. We need the same on the right side supported by 5 ft. at the top. 5 times some number equals 580. 5x = 580 x = 116 So, 116 lbs. is the weight of C. 32 20 students were needed. 48 days times 5 students (per shift) means they needed 240 total shifts. But each student could only work 12 shifts, so 20 students were needed. 33 There are 46 houses total on both sides of the street. There are several ways to solve the problem. One way is to realize the total number of houses will always be one less than the sum of two opposing houses.

75 The diagram shows three normal dice. How many dots are on the side of the last die that is facing the middle die? 76 One hundred dental specialists are attending a medical convention. Each specialist is either an orthodontist or an oral surgeon. At least one is an orthodontist. Given any two of the specialists, at least one is an oral surgeon. How many are orthodontists and how many are oral surgeons? 77 There are two ls between 1 and 10 (inclusive) and 21 between 1 and 100 (inclusive). How many 1s are between 1 and 1,000,000 (inclusive)?