The weight W of an aluminum flatboat varies directly with the length L of the boat. If a 13-foot boat weighs 234 pounds, then what is the weight of a 12-foot boat?
2007-11-02 11:37:13 · 11 answers · asked by batty_starr 2 in Science & Mathematics ➔ Mathematics
13ft is to 234 lb as 12ft is to W lb.
13ft /234 lb=12 ft/W lb
13/234 = 12/W (forget about the units, we know we need lbs)
13*W=12*234 (multiply both sides by the denominators)
13*W=2808
W=2808/13
W=216
So 216lb for a 12 ft boat.
2007-11-02 11:41:39 · answer #1 · answered by gaelicspawn 5 · 0⤊ 0⤋
just remember the X and Y let x=
or use the law of averages
if the boat is 13 feet long = 234 lbs., get the averag wt/ft
234 divided by 13 = 18lbs/foot
so 18 x 12 ft.= 216 lbs.for 12 ft. boat
2007-11-02 18:51:19 · answer #2 · answered by ruhtra t 2 · 0⤊ 0⤋
If it varies directly with length, then we have
W = kL
k = W/L
k = 234/13
k = 18
so
W = 18 x L
and the 12 foot boat weighs 216 pounds.
2007-11-02 18:42:56 · answer #3 · answered by Computer Guy 7 · 0⤊ 0⤋
well divide 13 into 234 and that makes 18. so for each foot of the boat its 18 lbs so subtract 18 from 234. :)
2007-11-02 18:40:55 · answer #4 · answered by Kalyn 1 · 1⤊ 1⤋
13/234 = 12/x , it's legal to flip fractions if you flip both sides
234/13 = x/12 , now multiply by 12 to get
216 = x
x = 216
2007-11-02 18:40:46 · answer #5 · answered by XPEH BAM 3 · 2⤊ 0⤋
divide 13 into 234, the average weight per foot or w.e. is 18 lbs. so subtract 18 from 234 and you've got ur answer
2007-11-02 18:42:35 · answer #6 · answered by californication 2 · 0⤊ 1⤋
yes 216 would be correct
divided largest weight by feet then take that answer and multiply by 12
2007-11-02 18:47:38 · answer #7 · answered by Anonymous · 0⤊ 0⤋
216 pounds
2007-11-02 18:45:28 · answer #8 · answered by pokemike01 4 · 0⤊ 0⤋
I got 253.5. I'm pretty sure you would set it up like this.
13/234 =12/x
2007-11-02 18:41:29 · answer #9 · answered by Anonymous · 0⤊ 2⤋
198 pounds.
2007-11-02 18:40:29 · answer #10 · answered by kuhfaye 4 · 0⤊ 2⤋