HCF of two or more number is the highest number which divides the given numbers exactly.
The maximum capacity of container = HCF [403, 434, 465]
Factors of 403 = 13×31
Factors of 434 = 2×7×31
Factors of 465 = 3×5×31
Clearly, HCF = 31
Therefore, 31 litres container is required to measure the diesel of three containers exact number of times.