A) 6.23 | B) 7.98 |

C) 8.97 | D) 9.89 |

Explanation:

Total quantity of petrol consumed in 3 years =(4000/7.50+4000/8+4000/8.50) liters

= 4000(2/15+1/8+2/17) liters

= 76700/51 liters

Total amount spent = Rs. (3 x 4000) = Rs. 12000.

Average cost = Rs. (12000*51/76700) = Rs. 7.98.

A) 62 kg | B) 61 kg |

C) 60 kg | D) 63 kg |

A) 59.2kg | B) 58.6kg |

C) 58.8kg | D) 59kg |

A) 33 | B) 34 |

C) 39 | D) 29 |

Explanation:

Let the fifth number be x.

The average of the first four numbers = 3x

Sum of all the first four numbers = 3x = 12x

The average of all the five numbers = 85.8

Sum of all the five numbers = 85.8 5 = 429

Sum of all the first four numbers + 5th number = 429

12x + x = 429

x = 429/13 = 33

The 5th number is 33.