If one- third of a number is subtracted from three-fourths of that number, the difference is 15.What is the number?
Please help me with this and show work
2007-06-06 15:24:34 · 5 answers · asked by Somebody 2 in Science & Mathematics ➔ Mathematics
let that number be b = 12a
From the informations given, we have
3b/4 - b/3 = 15
or 9a - 4a = 15
=>> a = 3
So the number is b = 12a = 36
2007-06-06 15:28:14 · answer #1 · answered by sk8erboinhl 2 · 1⤊ 0⤋
let that number be x
3/4 x - 1/3 x = 15
(3/4-1/3)x = 15
(9 -4)/(4*3) x = 15
5/12 x = 15
x = 15 * 12/5 = 3*12 = 36
x = 36
2007-06-06 15:30:46 · answer #2 · answered by roman_king1 4 · 0⤊ 0⤋
3x/4 - x/3 = 15
multiply by the lcd (12)
9x - 4x = 180
5x = 180
x = 36
*thinking*
yep, because 27 - 12 = 15
2007-06-06 15:30:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋
3/4*x-1/3*x=15
reducing to common denominator =12
(9x-4x)=12*15
5x=180 and x= 36
2007-06-06 15:30:30 · answer #4 · answered by santmann2002 7 · 0⤊ 0⤋
36 is the answer..
2007-06-06 15:33:31 · answer #5 · answered by x 2 · 0⤊ 0⤋