
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
 LinkBack  Thread Tools  Display Modes 
July 20th, 2019, 08:14 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  Why n4 in first step?
Q. A group of men can complete a work in 24 days. In first 13 days, they all work together and then after every day 2 men left. If the work would be completed in 27 days, what was the total number of men in that group? Shortcut: 24n=13n+n2+n414 days 24n=13n+14/2(2n426) 24n=13n+7(2n30) 24n=13n+14n210 3n=210 n=70 Why n4 in first step? Last edited by skipjack; July 21st, 2019 at 02:00 AM. 
July 20th, 2019, 09:33 PM  #2 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1 
In second step: 24n=13n+14/2(2n426) How 14/2(2n426) is written?? 
July 21st, 2019, 03:20 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
Each day, 2 men left. If that means that 2 men left just before (or as) day 14 commenced, n  2 men worked on day 14, n  4 men worked on day 15, and so on until n  28 men worked on day 27. It would be clearer to write (n  2) + (n  28), but 2n  4  26 is an equivalent expression. 

Tags 
step 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Matamicus  a math stepbystep problem solver  dalo  Math Software  1  March 17th, 2013 10:19 PM 
Stepbystep mathematics software/practice problems  iamdaniel  Academic Guidance  3  February 2nd, 2012 08:42 PM 
Wolfram now solves step by step differential equations!  Weiler  Differential Equations  1  January 31st, 2012 07:15 AM 
How can solve this simple equation please step by step  falcon  Algebra  3  December 11th, 2009 03:44 PM 
Calculating the following problem step by step  SkyDiver  Elementary Math  2  June 7th, 2009 02:22 AM 