Show me a random puzzle
 Most recent collections 


sum to infinity parabolas lines polygons irreducible numbers folding tube maps symmetry multiplication clocks integers quadratics rectangles proportion crosswords multiples prime numbers arrows christmas remainders probability cube numbers bases addition cryptic crossnumbers dodecagons shapes geometry pascal's triangle floors spheres odd numbers balancing functions star numbers squares algebra sums digits dice division factorials cryptic clues people maths triangle numbers means advent complex numbers calculus chess factors sport ellipses partitions scales speed integration coordinates hexagons shape rugby regular shapes angles surds doubling perimeter chocolate 3d shapes mean 2d shapes dates sequences palindromes trigonometry graphs money area triangles games number differentiation planes averages square roots routes numbers colouring fractions square numbers menace taxicab geometry ave perfect numbers indices books unit fractions volume coins grids time probabilty cards circles logic wordplay chalkdust crossnumber crossnumbers percentages


Show me a random puzzle
▼ show ▼

Coloured weights

You have six weights. Two of them are red, two are blue, two are green. One weight of each colour is heavier than the other; the three heavy weights all weigh the same, and the three lighter weights also weigh the same.
Using a scale twice, can you split the weights into two sets by weight?

Show answer & extension

© Matthew Scroggs 2019