Question

Samara has 500 dollars in her piggy bank. If she spends 5 dollars every month, the collective amount spent across 6 months is given by the sequence 5, 10, 15, 20, 25, 30. How much would the amount be in the 7th month?

5, 10, 15, 20, 25, 30, ?

• A. 35 dollars
• B. 31 dollars
• C. 40 dollars
• D. 36 dollars

Answer 1

The correct option is A 35 dollars

The given sequence is 5, 10, 15, 20, 25, 30.

Let us find the difference between the terms.

Difference between the 1st and the 2nd terms = 10 - 5 = 5

Difference between the 2nd and the 3rd terms = 15 - 10 = 5

Hence, to find the next term, we have to add 5.

Therefore, the 7th term = 30 + 5 = 35
The amount spent for 7 months will be 35 dollars.