A) 1 | B) 2 |

C) 3 | D) 5 |

Explanation:

Use unitary method:

In hours, 123 typists can type 984 paper

In 1 minute, 123 typists can type = 246 papers

In 1 minute, 1 typist can type =2 papers [ Hint hours = 4 minutes]

A) 1000 (r - p) + pq | B) 1000 p + qr |

C) 1000 (r - q) + pr | D) 1000(p - q) + qr |

Explanation:

We need to find the total cost to send r messsages, r > 1000.

The first 1000 messsages will cost Rs.p each (Or)

The total cost of first 1000 messsages = Rs.1000p

The remaining (r - 1000) messsages will cost Rs.q each (Or)

The cost of the (r - 1000) = Rs.(r - 1000)y

Therefore, total cost = 1000p + rq - 1000q

= 1000(p - q) + qr

A) 134 | B) 137 |

C) 139 | D) 141 |

Explanation:

A) Rs. 4680 | B) Rs. 4420 |

C) Rs. 4960 | D) Rs. 5480 |

Explanation:

Let the expenditure on the 95 students be 'x'

Then,

95x + 500 = 120(x – 5)

95x + 500 = 120x - 600

120x - 95x = 1100

25x = 1100

=> x = 44

Therefore, total expenditure of the hostel becomes

95 x 44 + 500 = 4680.

A) 20 | B) 35 |

C) 54 | D) 40 |

Explanation:

Numbers of students in section A = x

∴ Numbers of students in section B and C = (100 – x)

∴ x 70 + (100 – x) 87.5 = 84 100

=> 70x + 87.5 100 – 87.5x = 8400

=> 8750 – 17.5x = 8400

=> 17.5x = 8750 – 8400 => x = 20.

A) Rs. 8840 | B) Rs. 11,500 |

C) Rs. 12,800 | D) Rs. 9450 |

Explanation:

Manager's monthly salary

= Rs. (1900 x 25 - 1500 x 24) = Rs. 11,500