April 2013 Logic & Maths Puzzles

1. What is the greatest number of Mondays that can occur between January 1st and February 14th of any year?

2. An ant carries 1 crumb on the first day and 1 crumb on the second day. On the third day it carries 2 crumbs, on the fourth day it carries 3 crumbs. On day five it carries 5 crumbs and on day six it carries 8 crumbs. According to this sequence, how many crumbs will the ant carry on the seventh day? Write your answer as a numeral.

3. How many legs are there altogether on 2 spiders and 3 crickets?

4. Six female dogs have 4 puppies each. Half of these puppies are female and grow up to also have 4 puppies each. How many dogs are there in total?

5. At a local farm there are 20 animals altogether. The interesting thing is that there only chickens and donkeys. The farmer counts the legs and finds that there are 52 legs in total (not including his own). How many chickens are on the farm?

6. How many examples of the pattern on the left are contained in the net on the right?

The pattern can be rotated but not reflected.

pattern poser

 (click to enlarge and download)

7. A farmer keeps only four types of animals. He has a total of 560 animals.

If he had ten sheep less, he would have twice as many sheep as he has cows.

If he had ten cows less he would have three cows for every pig, and he has two-and-one-half pigs to every horse.

a. How many pigs does he have?

b. How many horses does he have?

c. If he swaps 75% of his cows for seven sheep per cow, how many animals will he have in total?

8. In each of the four sets below, the numbers on the left have been turned into the numbers on the right by applying the same formula. A different formula applies from set to set.

 cracking the code

In the example, each number on the left has been turned into the number on the right by multiplying by 2 then adding one. The answer (the number that replaces the question mark) is therefore

5 x 2 + 1 =11

9. Alice organised a reunion of her relations. She invited:

her mother

her mother’s sister-in-law

her sister

her sister’s mother-in-law

her mother-in-law’s sister

her sister-in-law’s mother

her next-door neighbour

Counting Alice, what is the fewest number of people that could attend the party if all invitations were accepted? No illegal relationships are permitted!

10. A wine merchant has six barrels containing respectively

300 litres

320 litres

360 litres

380 litres

400 litres

620 litres

Five barrels are filled with wine; one barrel is filled with beer.

The first customer purchases two barrels of wine.

The second customer purchases twice as much wine as the first customer.

Which barrel contains beer?

SOLUTIONS


COLLECTED LOGIC & MATHS PUZZLES – 1



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One Response to April 2013 Logic & Maths Puzzles

  1. Lisa Elbert says:

    very nice and interesting

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