Question

A man swims 1.5 mi on Monday, 1.6 mi on Tuesday, 1.8 mi on Wednesday, 2.1 mi on Thursday, and 2.5 mi on Friday.

If the pattern continues, how many miles will he swim on Saturday?
(Note: mi is the abbreviation used for miles)

• A. 2.7 miles
• B. 2.8 miles
• C. 2.9 miles
• D. 3.0 miles

Answer 1

The correct option is D 3.0 miles

Writing the distance covered while swimming by the man in sequence,
we get, 1.5, 1.6, 1.8, 2.1, 2.5

Here the difference between distance covered on:
Monday and Tuesday is 1.6-1.5 = 0.1
Tuesday and Wednesday is 1.8-1.6 = 0.2
Wednesday and Thursday is 2.1-1.8= 0.3
Thursday and Friday is 2.5-2.1 = 0.4

So, the difference between consecutive days is increasing by 0.1 mi.

$\therefore$ We should add 0.4 + 0.1 = 0.5 mi to Friday's distance to get Saturday's distance.

$\therefore \text{Distance covered on Saturday}=2.5+0.5=3.0mi$