# Numbers Questions

A) 5 | B) 4 |

C) 3 | D) 2 |

Explanation:

Since 653xy is divisible by 5 as well as 2, so y = 0.

Now, 653x0 must be divisible by 8.

So, 3x0 must be divisible by 8. This happens when x = 2

x + y = (2 + 0) = 2.

A) decrease | B) stay the same |

C) increase four fold | D) increase to more than double |

Explanation:

The best approach is to pick a number that satisfies the rules that x and y are greater than 0. So for example you could choose 25 for y.

The value of x before doubling is then 25 - 50/25 = 23

The value after doubling y will be 50 - 50/50 = 49, which is more than double.

A) 7 | B) 9 |

C) 11 | D) 5 |

Explanation:

LCM of 2, 3, 7 is 42.

=> (700 – 300)/42 = 9 22/42 => 9 Numbers.

A) 12/35 | B) 1/35 |

C) 35/8 | D) 7/32 |

Explanation:

Let a and b are the numbers.Then a+b is 12 and ab is 35.

a+b/ab = 12/35

1/b + 1/a = 12/35

A) 147 | B) 168 |

C) 162 | D) 182 |

Explanation:

The pattern is -4, +9,-16, +25, -36

The next number=119+49=168

A) 4981 | B) 6481 |

C) 4964 | D) 6449 |

Explanation:

The pattern is ${1}^{2}{2}^{2},{3}^{2}{4}^{2},{5}^{2}{6}^{2}$,

$\therefore $The next number= ${7}^{2}{8}^{2}$= 4964

A) 5x + 14y | B) 5x + 16y |

C) 5x + 5y | D) None |

Explanation:

Step 1 :2x + 5y

Step 2 :3(2x + 5y) = 6x + 15y

Step 3 :(6x + 15y) - (x +y) = 6x + 15y - x - y (watch that last minus sign!)

This gives 5x + 14y

A) 2 | B) 3 |

C) 4 | D) 5 |

Explanation:

By trial and error method, we get

2880/3 = 960 is not a perfect square

2880/4 = 720 is not a perfect square

2880/5 = 576 which is perfect square of 24

Hence, 5 is the least number by which 2880 must be divided in order to make it into a perfect square.