240
@215 deg/f steam you calculate 240 btu/ ft.sq of radiation
480
480
150 plus 3 times 30 is equal to 240.
6.67 times or 6 with remainder 24.
its 240 because do 15 times 6 and u do 25 times 6 and u add both of the total and u end up with 240......
120 plus 120 equals 240, or 240 plus 0 equals 240, and keep on adding!
-240
240 + 90 = 330
240
50 + 190 = 240