Leave as it is because 265 is already an integer which is a whole number without decimals or fractions.
265/30 = 8.833 gallons (rounded)
265 = 265/1
30% of 265 = 30% * 265 = 0.3 * 265 = 79.5
40% of 265= 40% * 265= 0.4 * 265= 106
60% of 265= 60% * 265= 0.6 * 265= 159
265-225 = 40
.80 * 265 = 21280% of 265 = 212
5, 265
265 - 225 = 40
265 divides by these numbers: 1, 5, 53, 265.
30% of 265 = 265*30/100 = 79.5