Question

Julie wrote the rate $108 in 6 weeks as a unit rate. Find her mistake and correct it.

(TIP: $108 = $54 )
( -------- = -------- )
( 6 weeks = 3 weeks)

Answer 1

Julie wants to express $108 in 6 weeks as a unit rate.

Her errors are:
$108 = $54 (Not true)
6 weeks = 3 weeks (Not true).

Instead,

`(\$108)/(6\,weeks) \\ = (\$54 * 2)/(3\,weeks * 2) \\ = (\$54)/(3\,weeks) \\ =18 \, (\$)/(week)`

The correct unit rate is 18 $/week.