It takes Sam 4 hours to rake the front lawn, while his brother, Dave, can rake the lawn in 2 hours. How long will it take them to rake the lawn working together?

1 hour 20 mins.

Step-by-step explanation:

If it takes Sam 4 hours, but it takes her brother 2, it would be one hour. Dave takes half the time it takes Sam. So if they worked together it would be 1 hour 20 mins.

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500