Question

J 5 hours 6 The table shows the number of miles Ken jogged the past 4 days. The next 4 days, he will decrease the number of miles to be 10% less. How many less miles will ken jog on day 4 after the decrease compared to the number of miles he jogged on day 4 in the table? Day 2 Mlies 6 2 A 0.9 mil B7 miles ISmile D 22 miles

Answer 1

In the past four days Ken runs 20 miles.

We can find this as the sum of the miles of the four days:

$2+4+6+8=20$

If he runs 10% less in the next four days. We assume that each day he will run 10% of the corresponding day (5th day compared to 1st days, 6th day compared to 2nd day, and so on).

Then, the 8th day he will run 10% less than 8 miles, what he run on the 4th day:

$M_8=8\cdot(1-0.1)=8\cdot0.9=7.2$

Then, the difference of what he ran in the 8th day compared to the 4th day is:

$\Delta M=8-7.2=0.8_{}$

Answer: The closest option is Option A (0.9 miles)