Question

On Monday Anders read for a quarter hour if he and crazy amount of time he read by seven minutes each day how many hours would he have red by Friday

Answer 1

By Friday he would have read for 145 hours.

Explanation:

Given:

Number of hours Anders read on Monday =15 minutes

Every day he increases the reading time by 7 minutes

This reading time forms an arithmetic progression

Here,

The first value is "a"=15

Common difference "d"=7

Number of days from Monday to Friday =5, Thus n=5

Number of minutes he read by Friday=sum up to 5 terms of the AP=S5

Number of times he read on Friday =a5

`a_(n) =a+(n-1)d\\\\a_(5) =a+(n-1)d\\=15+(n-1)7\\=15+(51)7\\=15+4*7\\=15+28=43\\\\\\S_(n) =n/2(a+a_(n) )\\\\=5/2(15+43)=2.5* 58=145\ hours`

Thus By Friday he would have read for 145 hours.