A) 6 | B) 8 |

C) 12 | D) 16 |

Explanation:

Side of smallest cube = L.C.M of 5,10,20 = 20cm

Volume of the cube = (20x20x20) = 8000

Volume of the block= (5x10x20) = 1000

Number of blocks = (8000/1000) = 8

A) 22/7 x 24/35 | B) 22/7 x 36 x 4 |

C) 22/7 x 36/5 | D) 22/7 x 37/21 |

Explanation:

Since level of water increased in cylinder by height 4.

This is because of the rectangular block .

Therefore , area of rectangular block immersed in water is = 22/7 x (6)^2 x 4

Thats why portion of block immersed in water is= (22/7 x 36 x 4) / total vol. of rectangle

= (22/7 x 36 x 4)/(7x5x6)

= 22/7 x 24/35.

A) 112 mts | B) 84 mts |

C) 96 mts | D) 108 mts |

Explanation:

Vol of silver = = 66 C.C

given D= 1mm => R = D/2 = 1/20 cm

=> = 66

= 66 x 400 x 7/22 = 8400 cm = 84 mtrs.

A) 14.69 cm | B) 29.39 cm |

C) 18.65 cm | D) 22.21 cm |

Explanation:

Volume of water flowing through 1 pipe of diameter x = Volume discharged by 6 pipes of dia 12 cms

As speed is same, area of cross sections should be same.

Area of bigger pipe of diameter x = Total area of 6 smaller pipes of diameter 12

i.e

Here R = R and R1 = 12/2 = 6

R = 14.696

=> D = X = 14.696 x 2 = 29.3938 cm.

A) 175 | B) 345 |

C) 265 | D) 300 |

Explanation:

Number of books that can be placed in the larger box is given by Volume of Box / Volume of book.

Now, n = 25 x 42 x 60 / 7 x 6 x 5

= 63000 / 210

= 300.

300 books can be in that box.

A) 9216 | B) 10246 |

C) 12345 | D) 7527 |

Explanation:

It takes four of those little squares -- each one 1/2 inch on a side -- to cover one square inch. That's because each one is 1/2 x 1/2, or 1/4 of a square inch.

In a rectangle that is 48 inches by 48 inches, there are 2304 square inches.(1 ft = 12 inches)

Since it takes 4 little squares to cover 1 sq inch, then it would need 2304 x 4 squares (1/2 inch on a side each) to cover a rectangle 4 feet by 4 feet.

That is 9,216 of those squares.