book Maths Puzzle Numerical Ability

what is the smallest number that is divisible dy four different primes?Why or why not?

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book Other Question

Given that (3x – a)(x – 2)(x – 7) = 3x3 – 32x2 + 81x – 70, determine
the value of a.
I am having trouble solving this inequality. Please help me. Thanks

-6 < 5y - (2y - 9)