solve (retiring soon)

Please make sure students have mastered solvingReady (retiring soon) (7) or 10 bond (retiring soon) (5) before beginning solve

for new see solveSingleStage and solveMultiStage

sample Q from each layer	teach-learn questions
layer	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17
practise-learn worksheets
print hints	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp	d/s 2pp		d/s 2pp	d/s 2pp