http://www.neuropolis.org/snake-puzzle/

Solve this puzzle………?
Susie the snake has up to 20 eggs.
She counted her eggs in fours.
She had 3 left over.
She counted them in fives.
She had 4 left over.
How many eggs has Susie got?
Show your workings.
THE CORRECT ANSWER IS 19 EGGS.
I showed my work and unit of measure. The real answer is: Susie has nineteen eggs.
19<20.
4, 8, 12, 16 + 3 = 19
5, 10, 15 + 4 = 19
(n divided by 4) + 3 = (n divided by 5) + 4 = n<20
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Solving Snake Puzzle