Problema Solution
Twin brothers, Billy and Bobby, can mow their grandparents lawn together in 61 minutes. Billy could mow the lawn by himslef in 25 minutes less time that it would take Babby. How long would it take bobby to mown the lawn by himself?
ROund to nearest minute.
Answer provided by our tutors
Billy + Bobby = 61 , Together
Billy = Bobby - 25 , Billy by himself
Bobby -25 +Bobby = 61 , substitute
2Bobby =61+25 , solve for bobby
Bobby=86/2=43