My Math Forum How to solve this problem?
 User Name Remember Me? Password

 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 July 8th, 2018, 10:27 PM #1 Senior Member   Joined: Aug 2014 From: India Posts: 343 Thanks: 1 How to solve this problem? Two pipes A and B are connected to a tank. A can fill the tank with 80% pure milk in 7 hours, while B can fill the tank with 90% pure milk in 3 hours. What will be the purity of the milk in the tank if both the pipes are opened together to fill the empty tank? Solution: A is 80% and B is 90%. Here B is filling the tank fast. I can't proceed from here. please help me.
 July 9th, 2018, 01:48 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,464 Thanks: 2038 The "filling-ratio" of the pipes is 3:7, so pipe A supplies 3/(3 + 7) = 30% of the tank's capacity, and pipe B supplies 70% of the tank's capacity. Hence the purity that results will be 80% of 30% + 90% of 70% = 87%.
 July 9th, 2018, 03:31 PM #3 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,277 Thanks: 1023 Hey Skip, you told me recently not to give out full solutions.....???? Here: Why 4:7 is not the answer? Last edited by Denis; July 9th, 2018 at 03:34 PM.
 July 10th, 2018, 12:02 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,464 Thanks: 2038 The opening post there contained "Please don't post the final answer."
 July 10th, 2018, 04:13 AM #5 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,277 Thanks: 1023 I give up...

 Tags problem, solve

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post Ganesh Ujwal Geometry 24 April 7th, 2018 07:57 AM muneeb977 Linear Algebra 2 January 21st, 2017 06:36 PM newmathuser Elementary Math 4 November 22nd, 2016 03:52 PM Ganesh Ujwal Calculus 1 December 31st, 2014 07:17 PM RubberMan Elementary Math 6 April 12th, 2013 12:16 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top

Copyright © 2019 My Math Forum. All rights reserved.