A) 60 | B) 30 |

C) 70 | D) 90 |

Explanation:

Let 'x' be the number of new Rs.2000 notes.

Given for one new 2000 note there are three old 500 notes.

i.e, 3x

Given 10 more new Rs.2000 notes are added to the collection

and the ratio of new Rs.2000 notes to old Rs.500 notes

$\frac{x+10}{3x}=\frac{1}{2}\Rightarrow x=20$

Therefore, number of new Rs.2000 notes = x+10 = 30.

old Rs.500 notes = 3x = 60.

Thus, the total number of notes in the collection = 30 + 60 = 90.

A) to calculate the product of two variables to make a third variable | B) to count the number of cases that fall into different subgroups within a dataset |

C) to count the number of times a dataset is used by a student | D) to calculate the sum of a column of variables in a dataset |

Explanation:

Frequency is what means how many times the event occurs in the same period.

A) B + C | B) A + C |

C) C + C | D) B + A |

Explanation:

**Complementary angles are those whose sum is 90**.

Given here, is a right angled triangle, where anfle C is 90 deg. In this, sum of Angles A + C = 90, since, sum of angles in a right angled triangle = 180, angle C = 90 and

hence sum of **A + B = 180 - C = 180 - 90 = 90.**

Hence, the pair of cimplementary angles in the given triangle = Angle **A + B.**

A) Supplementary angles | B) corresponding angles |

C) Complimentary angles | D) Alternate angles |

Explanation:

**Complimentary angles** are those two angles whose sum is 90 whereas two angles whose sum is 180 are called Supplementary angles.

A) 201 | B) 205 |

C) 211 | D) 203 |

Explanation:

From the trial and error method of division,

201 is divisible by 3

205 is divisible by 5

203 is divisible by 7

Hence, after eliminating three options, remained is 211 and is divisible by only 1 and itself.

Therefore, 211 is the smallest prime number greater than 200.

A) A point has no dimension and a line has one dimension. | B) A line can have line segments on it whereas a point cannot be on any line segment. |

C) point is a location whereas a line has several planes located on it | D) A line can lie on a plane whereas a point cannot lie on a plane. |

Explanation:

A point has no dimension and a line has one dimension is the statement that best compares a line and a point.

A) 910 | B) 90 |

C) 91 | D) 100 |

Explanation:

9 tens 10 ones equals

=> 9 x 10 + 10 x 1

=> 90 + 10

=> 100.

A) 28 | B) 2 |

C) 2800 | D) 280 |

Explanation:

Here asked for the value of 28 tens

=> 28 x 10 = 280.

A) 2 | B) 6 |

C) 4 | D) 8 |

Explanation:

A square and a rectangle each have 4 right (90 deg) angles.

Both square and rctangle have 4 sides and 4 angles, but the only difference is square is a rectangle with all sides equal.