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ICSE Class 8 Answered

2 men and 5 women can do a piece of work in 4 days,while one man and one woman can finish it in 12 days.how long it take for a man to do the work?  
Asked by adityachoraria18 | 18 Feb, 2018, 09:11: PM
answered-by-expert Expert Answer
begin mathsize 16px style Let space work space done space by space man space be space straight m space and space work space done space by space woman space be space straight n. 2 straight m plus 5 straight n equals 1 fourth 8 straight m plus 10 straight n equals 1 10 straight n equals 1 minus 8 straight m straight n equals fraction numerator 1 minus 8 straight m over denominator 10 end fraction............ left parenthesis straight i right parenthesis straight m plus straight n equals 1 over 12 12 straight m plus 12 straight n equals 1........... left parenthesis ii right parenthesis From space left parenthesis straight i right parenthesis 12 straight m plus 12 straight n equals 1 12 straight m plus 12 open parentheses fraction numerator 1 minus 8 straight m over denominator 10 end fraction close parentheses equals 1 implifying space you space get space straight m equals 1 over 12 One space man space can space finish space work space in space 12 space days. end style
Answered by Sneha shidid | 19 Feb, 2018, 10:45: AM

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ICSE 8 - Maths
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ICSE Class 8 Maths Linear Equations The answer maybe rechecked. Ans: Let B's age= x Then A's age= x+5 5years ago: B's age was= (x-5)yrs A's age was= (x+5-5)yrs = x yrs As per question: A's age/B' age= 3/2 x/x-5=3/2 2x=3x-15 3x-2x=15 B's Present age = x=15 yrs(Ans) A's present age= x+5= 15+5= 20 yrs(Ans) But, The answer given in the uploaded video are 5 yrs and 10 yrs Please recheck this.  
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