A) 12 days | B) 18 days |

C) 24 days | D) 30 days |

Explanation:

A + B = C + D

| | | |

Ratio of efficiency 10x + 5x 9x + 6x

|________| |_________|

15x 15x

Therefore , ratio of efficiency of A:C =10:9

Therefore, ratio of days taken by A:C = 9:10

Therefore, number of days taken by A = 18 days

A) 50 days | B) 80 days |

C) 24 days | D) 37.5 days |

A) 12.5 days | B) 100 days |

C) 22.5 days | D) 35 days |

A) 25 days | B) 20 days |

C) 80 days | D) 24 days |

A) 10 days | B) 30 days |

C) 15 days | D) 20 days |