A can copy 50 papers in 10 hours while both A & B can copy 70 papers in 10 hours. Then for how many hours required for B to copy 26 papers
2006-10-04 18:28:51 · 6 answers · asked by yamuna s 1 in Science & Mathematics ➔ Mathematics
70/10 - 50/10 = 20/10
20/10 = 2/1 = 2
B can copy 2 papers per hour
Hou many hours is required for B to copy 26 papers
Divide 26 ÷ 2 = 13
It will take B 13 hours to copy 26 papers.
2006-10-05 04:07:58 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
A copy 1/5 papers in 1 hour
A+B copy 1/7 papers in 1 hour
how much paper will B copy in 1 hour will be given by
1/5-1/7
(7-5)/35
2/35
that means to copy 35/2= 17.5 papers B take 1 hour
for 1 paper B will take= 1/17.5
or= 2/35
for 26 paper B will take= (2 *26)/35
= 52/35
=1.48 hour
2006-10-05 02:42:09 · answer #2 · answered by Nick 3 · 0⤊ 0⤋
A = 50/10
B = 70/10-50/10 = 20/10
20/10=26/X
X = 26*10/20
2006-10-05 01:38:59 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋
b copy 20 paper in 10 hr
1 " " 10/20 hr
26 10*26/20 hr =13 hr
2006-10-05 01:36:35 · answer #4 · answered by bike-man 2 · 0⤊ 0⤋
13
2006-10-05 02:50:41 · answer #5 · answered by Rockstar 6 · 0⤊ 0⤋
A=5papers/hr
A+B=7papers/hr
so...
B=2papers/hr
26papers/(2papers/hr)=13hrs
2006-10-05 01:36:39 · answer #6 · answered by fleisch 4 · 0⤊ 0⤋