2 x 3 x 3 = 18
3 x 5 = 15
2 x 3 x 3 x 5 = 90, the LCM
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Highest prime factor, indeed only prime factor, is 5
Seven is the highest prime factor. The prime factors for 210 are: 2 x 3 x 5 x 7
97
The prime factors of 125 are 5x5x5. The highest proper factor is 25.
This is a LCM question, so factor all and find the highest power of each prime factor. 2 is prime 3 is prime 5 is prime 6 is [2 3] 7 is prime. LCM is [2] [3] [5] [7] so the answer is 210◄