2
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18 9,2 3,3,2 30 15,2 5,3,2 42 21,2 7,3,2
6
highest common factor is 6
To find the Least Common Multiple (LCM) of 18, 30, and 42, we first need to find the prime factorization of each number. 18 = 2 * 3^2 30 = 2 * 3 * 5 42 = 2 * 3 * 7 Then, we take the highest power of each prime factor that appears in any of the numbers. 2^1 * 3^2 * 5^1 * 7^1 = 2 * 3^2 * 5 * 7 = 630 Therefore, the LCM of 18, 30, and 42 is 630.
30% of 42= 30% * 42= 0.3 * 42= 12.6