Before decimalisation of the currency, but not before use of decimals for other calculations.
So the wall is 12 feet by 9.5 feet.
So an area of 108 (=12 x 9) + 6 (=12 x 0.5) => 114 square feet.
One pint covers three square feet.
So, 38 (=114 / 3) pints of paint are needed.
There 8 pints in a gallon.
So 5 gallons of paint are needed.
So notionally two pints left over, but as a practical matter more paint than 38 pints is needed as some will be left on the brush and be washed away when clearing up afterwards.
One gallon of paint costs 12/6, which means (for the benefit of younger readers) 12 shillings and sixpence. The work sixpence meaning six pence, but said as one word back then)
So five gallons costs 62 shillings and 6 pence.
That is £3 2s 6d
Conclusions
How many gallons of paint must the painter buy to paint the wall? 5
How much will it cost? £3 2s 6d
So, here’s a challenge. How many GN users can work that out? I don't know, but the number is at least one.
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