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00:00 - 00:59 | hello friends in this question we are given that A and B can do a piece of work in 12 days B and c together can do it in 15 days and C and it together can do it in 20 days now we have to calculate that how many days will they finish it together and separately ok to be have a + b x 12 days B + c 15 days and C and a takes 20 days to complete the same work so now if we if we calculate the work done in one day my dear so the work done by a + b would be one by 12 b + c |

01:00 - 01:59 | similarly be won by 15 and C plus a would be won by 20 so this is our first equation is a second equation and this is a third equation ok so don't know if we add equations add all three equations we get to of a + b + C is equal to 1 by 12 + 1 by 15 + 1 by 20 and if you take the LCM it would be 60 and 12125 60 + 15 24 60 + 20 into that comes out to be 12 by 60 that is 1 by 5 that means we have twice of a + b + c |

02:00 - 02:59 | is equal to 1 by 5 show a + b + c would be 1 by 5 into two that is 1 by 10 this means that a + a b and c together can do one tenth of the work in one day that means they will take a + b + c together would take 10 days to complete the work so here we have a + b + c equal to 10 latest take this as question for now we have to also calculate that how much time will they take if they do the work separately so for that we have to subtract all the three equations individually from this new equation for that means if we subtract equation 1 |

03:00 - 03:59 | from equation for we get it as equation 1 is a + b + c minus 1 is a + b that gives as 1 by 10 - 1 by 12 so here we have a and b together can fill out and the remaining is C is equal to by taking the LCM we have 66 - 5 that gives us One by 60 that means seat does one by 60th of the work in one day it means that she takes 60 days to complete the work we have see that is 60 days now similarly we can subtract the other two equations like |

04:00 - 04:59 | equation for - equation two gases a + b + c minus b + C is equal to 1 by 10 - 1 by 15 now here bnc gets cancelled out and we have the work done by a that is and protecting LCM we have 33 - 2 returns 130 that means a takes 30 days so we have a that takes about 30 days to complete the work we can find that for be also by equation 4 - equation 3 that is a + b + c minus C + 1 by 10 - 120 now here CMD get cancel out |

05:00 - 05:59 | work done for me that is LCM 22 - 1 that is 1 by 20 and Sobi does the same work in 24 found out that if a b and c work together to complete and 10 days and a takes 30 days B takes 20 days and C takes 60 days to complete the work thank you |