Model 1: The Basic Alligation Rule

04 Try it yourself Interactive

Five graded questions, one method

These presets are the placement, competitive and challenger questions from the source material, in order of difficulty. Note that the last one comes out 1 : 1 — equal quantities — which surprises students who expect a lopsided answer from a purity question.

Tea 110 / 130, mean 118, total 100 kg

3 : 2 → 60 kg

For the coins question the mean of 15.5 has already been computed for you; deriving it is the point of practice problem four.

Press Next to work through it one step at a time.

Cheaper–

Dearer–

Ratio–

Cheaper qty–

step 0 / 0