book Maths Puzzle Numerical Ability

In an endurance race, Alyson rode her bike 7 miles less than Jeff. Together they rode 39 miles. How far did Jeff Ride?

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book Other Question

Can someone help me with this problem?

What would be the least common multiple of 3, 6, and 9.

Thanks!
Sher solve the polynominal equation 3x^4=6x^2 by factoring