Completes the sequence 20 5 30 6 42 7?

Answer 1

56

20

5 (divide 20 by 4)

30 (multiply 5 by 6)

6 ( divide 30 by 5)

42 (multiply 6 by 7)

7 (divide 42 by 6)

....as you can see the pattern switches from division to multiplication. From this pattern the next number will be mulitplying 7 by 8. so the next number is 56.

Answer 2

56 8 72 9 90 10 Divide by four, multiply by six, divide by five, multiply by seven... Divisors increase by one each time, as do the number multiplying by.