Question

jamie kept track of the total hours and minutes she worked this week at the local health food store.

monday - 5 hours 45 minutes
wednesday - 4 hours
thursday - 4 hours 45 minutes
sunday - 6 hours 30 minutes

how many decimal hours did jamie work this week?
18.50
19.93
20.20
21.00

Explanation:

Step1: Convert minutes to decimal hours

Monday: $45 \text{ minutes} = \frac{45}{60} = 0.75 \text{ hours}$, so total $5 + 0.75 = 5.75 \text{ hours}$
Wednesday: $4.00 \text{ hours}$
Thursday: $45 \text{ minutes} = \frac{45}{60} = 0.75 \text{ hours}$, so total $4 + 0.75 = 4.75 \text{ hours}$
Sunday: $30 \text{ minutes} = \frac{30}{60} = 0.50 \text{ hours}$, so total $6 + 0.50 = 6.50 \text{ hours}$

Step2: Sum all decimal hours

$5.75 + 4.00 + 4.75 + 6.50$

Step3: Calculate total hours

$5.75 + 4.00 = 9.75$; $9.75 + 4.75 = 14.50$; $14.50 + 6.50 = 21.00$

Answer:

21.00