Question

The number of bacteria in a solution over time is specified. Find the number of bacteria after 40 minutes.

• A. 1,440
• B. 1,880
• C. 2,880
• D. 16

Answer 1

The correct option is C 2,880

The number of bacteria at 10, 20, 30 minutes is:

120, 240, 720

This is a multiplicative pattern.

When we multiply 120 by 2, we get 240, the second term.

When we multiply 240 by 3, we get 720, the third term.

To find the next term, we have to multiply 720 by 4.

= 720 $\times$ 4 = 2,880

Hence, the number of bacteria after 40 minutes = 2,880