In this context, HCF should mean hundred cubic feet, which is approximately 748 US gallons (see related link). To calculate it, use 231 cubic inches to a US gallon, and a cubic foot is (12 in)³ = 1728 cubic inches.
A hundred cubic feet, a unit of measure of water volume, usually encountered in water metering and billing, equivalent to 748 gallons.
69% of 748= 69% * 748= 0.69 * 748= 516.12
The factors of 698 are: 1, 2, 349, 698
209.430% of 698= 30% * 698= 0.30 * 698= 209.4
The answer is 698
34
25% of 698 = 174.5
748 is not prime. 748 = 2 * 2 * 11 * 17
748 * 34 = 25,432
0.1132
43.625