200 sweets is (s)

Full tub of sweets [[s]]
Take 30 out the tub [[s-30]]
Add 70 to the tub [[s+70]] 
Add another full tub [[2s]]
Remove half of the sweets [[s over 2]] 
Add 2 more full tubs [[3s]]

George is (x)

Two years older than George [[x+2]]
Five years younger than George [[x-5]] 
Half Georges Age [[x over 2]]
Twice George's Age [[2x]]