Starting with five every consecutive line has a number that is four less than twice the previous line how many marbles must be in the sixth line?

Answer 1

Let's denote the number of marbles in the first line as (5). According to the rule given, each subsequent line has a number that is four less than twice the previous line. The sequence can be expressed as follows:

• Line 1: (5)
• Line 2: (2 \times 5 - 4 = 6)
• Line 3: (2 \times 6 - 4 = 8)
• Line 4: (2 \times 8 - 4 = 12)
• Line 5: (2 \times 12 - 4 = 20)

Now, for the sixth line: (2 \times 20 - 4 = 36). Thus, there must be 36 marbles in the sixth line.