You've got 50 tons of tin but someone only wants to buy that in units of hundredweight, to change the units multiply by 19.68413. Now you have 984.2065 hundredweight.
How many hundredweight of steel are there in 36 tons? Just multiply by 19.68413 to get the answer of 708.6287 hundredweight.
In 17 tons of lead there are 334.6302 hundredweight, to achieve this take 17 and just multiply by 19.68413.
To convert 16 tons into hundredweight multiply by 19.68413 giving 314.9461 hundredweight.
You have 1 tons of coal but you need to know how many hundredweight that is. To get the answer multiply by 19.68413 which gives you 19.68413 hundredweight.