It would be good to add a test where the solution is not 5*a, which always happens when b = 2*a.
e.g. a=2, b=9, r=17; a=1, b=8, r=13; a=18, b=25, r=73; etc.
good one :)
The circle is inscribed in a square. And the rectangle touching the square corner intersects the circle at one vertex precisely. (This needs to be said: we can't trust our eyes.)
Find the sum of all the numbers of the input vector
Remove the small words from a list of words.
Least common multiple of many numbers
Mysterious digits operation (easy)
Number of divisors of a given number
Which way to go?
Slicing the cube
Speed of light:Experiment
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