A pattern is 5, 10, 15, 20, ... What is the 20th term?

A pattern is 5, 10, 15, 20, ... What is the 20th term?

• A. 90
• B. 100
• C. 110
• D. 95

Answer: (B)

This question tests arithmetic sequences and how to find a specific term when a pattern adds the same amount each step. The pattern starts at 5 and increases by 5 each time, so the nth term is 5n. For the 20th term, multiply 5 by 20: 5 × 20 = 100. So the correct value is 100. The other numbers correspond to earlier or later terms: 90 is the 18th term (5 × 18), 95 is the 19th term (5 × 19), and 110 is the 22nd term (5 × 22).

This question tests arithmetic sequences and how to find a specific term when a pattern adds the same amount each step.

The pattern starts at 5 and increases by 5 each time, so the nth term is 5n. For the 20th term, multiply 5 by 20: 5 × 20 = 100.

So the correct value is 100. The other numbers correspond to earlier or later terms: 90 is the 18th term (5 × 18), 95 is the 19th term (5 × 19), and 110 is the 22nd term (5 × 22).