A) Total work | B) One-fourth work |

C) Half work | D) Two-third work |

Explanation:

A can do the work = 18 days

B can do the work = 18/2 = 9 days

(A + B)'s 1 day work = 1/18 + 1/9 = 1/6

=> In 3 days = 3x1/6 = 1/2 work is completed.

A) Rs. 22.5 | B) Rs. 2.5 |

C) Rs. 202 | D) Rs. 25 |

Explanation:

We know that I = PTR/100

=> P = 20250/4.5 = 4500

Now, new Interest at 5% = 4500x1x5/100 = 225

Now the additional amount = 225 - 202.5 = Rs. 22.5

A) 180 | B) 300 |

C) 480 | D) 260 |

Explanation:

Let the number be 'N'

Given N + 30N/100 = 390

=> 130N/100 = 390

=> N = 390 x 10/13

=> N = 300.

A) 240 paise | B) Rs. 1.40 |

C) Rs. 2.20 | D) Rs. 3 |

Explanation:

I = PTR/100

I = 25 x 4 x 0.03/100

I = 0.03 x 100 = 300 Ps = Rs. 3

A) 15 | B) 20 |

C) 10 | D) 8 |

Explanation:

Let the price of each note book be Rs.x.

Let the number of note books which can be brought for Rs.300 each at a price of Rs.x be y.

Hence xy = 300

=> y = 300/x

(x + 5)(y - 10) = 300 => xy + 5y - 10x - 50 = xy

=>5(300/x) - 10x - 50 = 0 =>

multiplying both sides by -1/10x

=>

=> x(x + 15) - 10(x + 15) = 0

=> x = 10 or -15

As x>0, x = 10.