A) 11.8 | B) 12.9 |

C) 13.7 | D) 14.5 |

Explanation:

Let the present ages of Mahesh, Nilesh and Ramesh be k, l and m respectively.

k/l = 5/x ------ (1)

k = m - 18 ------ (2)

m + 9 = 47 ------ (3)

k - l = m ----- (4)

(3) => m = 47 - 9 = 38 years

(2) => k = 38 -18 = 20 years

(1) => 20/l = 5/x => l = 4x

(4) => 4x - 20 = 38

=> 4x = 58 => x = 14.5

A) 8 kmph | B) 6 kmph |

C) 7.5 kmph | D) 5.5 kmph |

Explanation:

Speed of the stream = 1

Motor boat speed in still water be = x kmph

Down Stream = x + 1 kmph

Up Stream = x - 1 kmph

[35/(x + 1)] + [35/(x - 1)] = 12

x = 6 kmph

A) 87.5 | B) 89 |

C) 91.5 | D) 93.5 |

Explanation:

We have M1 D1 H1 / W1 = M2 D2 H2 / W2 (Variation rule)

(60 x 30 x 8)/ 150 = (35 x D2 x 6) / 200

D2 = (60 x 30 x 8 x 200) / (150 x 35 x 6) => D2 = 91.42 days =~ 91.5 days.

A) 87 | B) 59 |

C) 92 | D) 81 |

Explanation:

Number = 271 x 96 + 0 = 26016

=> 95) 26016 (273

25935

--------

81

Required number = 81.

A) 600 | B) 610 |

C) 609 | D) 599 |

Explanation:

Two men, three women and one child can be selected in ⁴C₂ x ⁶C₃ x ⁵C₁ ways

=

= 600 ways.