Hard Riddles and Math exercices

Ra8 · 2011-06-05T18:17:02+00:00

I found some nice and challenging riddles and math exercises i'd like to share with you. Don't answer if you already know the riddle/exercise and don't Googl...

Georges

3. 30 Degrees.

Draw 2 parallel lines, don't forget equilateral triangles and Isosceles Trapezoid and you'll find the answer.

Ra8

@Georges correct it's 30 degrees but m0ei gave all the answers already

#16
John visits Dave and asks him how old are each of your 3 children?
Dave replies:"The product of their ages is 36 and the sum of their ages is equal to my house number"
John says:"I still can't guess their ages, can you give me more hints?"
Dave says:"Oh yeah i forgot to tell you that my oldest son's birthday is next week and the two other's already passed weeks ago"
John:"Thanks now i know how old are you children"
-> How old is each of Dave's children?

#17
I don't know if this is hard for you... but it's hard for my level:
Integrate (tan x)^6 dx

#18
It's all over the internet try to explain by yourself the missing square

Georges

Ra8 wrote@Georges correct it's 30 degrees but m0ei gave all the answers already

Man, it was 2.30 am when i read this exercise. I didn't read any other posts by members.
Just the 1st post and i quickly thought of it and solved it.

mezin

For 17 the angles of the triangles are different and the difference in the two slopes is the square that's "missing"

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