If α, β are the roots of 6x² + 13x + 7 = 0, then the equation whose roots are α², β² is:

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.

Find the smallest number which when increased by 20 is completely divisible by 12, 20, 15, 18 and 24.