A) 55% | B) 65% |

C) 75% | D) 85% |

Explanation:

Let original radius = R.

New radius = =

Original area = and new area =

Decrease in area = = 75%

A) 288 sq.cm | B) 188 sq.cm |

C) 144 sq.cm | D) 244 sq.cm |

Explanation:

Length of the thread is 36 cms.

length wise twice breath wise once then totally thrice.

so 36/3 = 12.

so length is 12 x 2 = 24 cms

breath is 12 cms

Area of the book = length x breath = 24 x 12 = 288 sq.cm

A) 119.21 sq cm | B) 115.395 sq cm |

C) 104.214 sq cm | D) 111.241 sq cm |

Explanation:

Because each vertice of the square is the center of a circle

(1/4) part of the total area of each circle inside of the square.

(3/4) part of the total area of each circle outside of the square.

Thus total area outside the square is = 115.3955 sq cm.

A) 844 | B) 814 |

C) 840 | D) 820 |

Explanation:

Length of largest tile = H.C.F. of 1517 cm and 902 cm = 41 cm.

Area of each tile = (41 x 41) sq.cm

Required number of tiles =1517 x 902/(41 x 41) = 814.

A) Rs. 345.15 | B) Rs. 245.1 |

C) Rs. 234.18 | D) Rs. 456.65 |

Explanation:

area of the plot = 120m x 60m = 7200 sq.m

area of plot excluding gravel = 117m x 57m = 6669 sq.m

area of gravel = 7200 sq.m - 6669 sq.m = 531 sq.m

cost of building it = 531 sq.m x 65 ps

= 34515 ps

In Rs. = 34515/100 = Rs. 345.15.

A) 14:9 | B) 13:12 |

C) 16:5 | D) 17:13 |

Explanation:

Area of a square SxS = 1024 => S = 32 cm

Length of the rectangle = 32x2 cm = 64 cm

Breadth of the rectangle = 32 - 12 = 20 cm

Required ratio = 64 : 20 = 16 : 5