Jill weighs 160 pounds but is now on a weight reduction plan to loose an extra average of 1.5 lb per week.
Her brother weighs 108 pounds but is on a weight gain plan to gain an average of 2.5 pounds per week.
After how many weeks will they both weight the same?
2007-11-05 10:39:15 · 4 answers · asked by Anonymous in Health ➔ Diet & Fitness
if the number of weeks is x
at the end of x weeks Jill weighs 160 - 1.5x
Her brother weighs 108 + 2.5x
160 - 1.5x = 108 + 2.5x
52 = 4x
x = 13 weeks
2007-11-05 10:44:28 · answer #1 · answered by Orinoco 7 · 0⤊ 0⤋
13 Weeks.
2007-11-05 18:47:40 · answer #2 · answered by Jeff A 5 · 0⤊ 0⤋
160lbs-1.5lbsx=108bs+2.5lbsx-starting equation. You must set the equations equal to solve with x=to # of weeks til they weigh the same. then solve to get x alone.
160lbs-1.5lbsx=108bs+2.5lbsx
+1.5lbsx +1.5lbsx
_______________
160lbs=108lbs+4lbsx
-108lbs -108lbs
_______________
52lbs=4lbsx
divide both sides by 4
_______________
13=x=# of weeks til they weigh the same
2007-11-05 18:47:58 · answer #3 · answered by nickybickyboppers 3 · 0⤊ 0⤋
i think it's 13 wks
2007-11-05 18:43:59 · answer #4 · answered by chella35 2 · 0⤊ 0⤋