122.
What remains will be 8 if we take 10 and double it by writing one 10 over another so as to form 18, and then deduct 10.
123.
If the average weight of the Oxford crew is increased by 2℔s., when one of them who weighs 12 stone, is replaced by a fresh man, the weight of that substitute is 13 stone 2℔s.
124.
If a motor-car is twice as old as its tyres were when it was old as its tyres are, and if, when these tyres are as old as the car itself is now, their united ages will be 21⁄4 years, the car is now 12 months old, and the tyres have had 9 months’ wear.