21:

Average age of a committee of seven trustees is the same as it was five years ago, a younger man having been substituted for one of them. How much younger was he then trustee whose place he took?

A. | 32 years |

B. | 35 years |

C. | 33 years |

D. | 34 years |

Increase after 5 years should have been 7 x 5 = 35 years. |

22:

What is the least number which must be subtracted from 1936 so that the remainder when divided by 9, 10, 15 will leave in each case the same remainder 7?

A. | 32 |

B. | 53 |

C. | 46 |

D. | 39 |

L.C.M. of 9, 10 and 15 = 90 |

23:

What is the maximum sum of the series 60, 58, 56, 54, 52, ?

A. | 840 |

B. | 880 |

C. | 930 |

D. | 1120 |

Since d = -2, maximum sum of the series will be sum of all the positive terms. |

24:

What is the least number which on being divided by 12, 21 and 35 will leave in each case the same remainder 6?

A. | 210 |

B. | 414 |

C. | 420 |

D. | 426 |

L.C.M. of 12, 21 and 35 = 420 |

25:

Six men A, B, C, D, E, F agree with a seventh man G to provide a sum of money among them. A, B, C, D, E, F are to subscribe Rs.10 each, and G is to pay Rs.3 more than the average of the seven. What is the whole sum to be provided?

A. | Rs.73.50 |

B. | Rs. 74 |

C. | Rs. 73 |

D. | Rs. 72.50 |

let average of the seven men be x |

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