Question

Michelle walks 1/4 hour every day of the week

Answer 1

Michelle walks 1/4 hour per day

In 1 week she walks in 7 days, then she walks:

`(1)/(4)\cdot7=(7)/(4)\text{ hours per w}eek\text{ }`

And in 9 weeks she walks:

`(7)/(4)\cdot9=(63)/(4)=(60+3)/(4)=(60)/(4)+(3)/(4)=15(3)/(4)\text{ hours}`

Sandra walks 2/4 hour per day

In 1 week she walks in 5 days, then she walks:

`(2)/(4)\cdot5=(10)/(4)=(5)/(2)\text{ hours per w}eek`

And in 9 weeks she walks:

`(5)/(2)\cdot9=(45)/(2)=(44+1)/(2)=(44)/(2)+(1)/(2)=22(1)/(2)\text{ hours}`

Therefore, Sandra walked more.

`(45)/(2)-(63)/(4)=(45\cdot2-63\cdot1)/(4)=(90-63)/(4)=(27)/(4)=(24+3)/(4)=6(3)/(4)`

Sandra walked 6 3/4 more hours than Michelle.