Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

What is the digit at units place: 7575 × 1390 × 9505?

### Question 2

The sum of three consecutive odd integer numbers is -2313. The middle among the three is?

### Question 3

What is the digit at units place: 2840 × 2492 × 6032?

### Question 4

When a two digit number is reversed and added to itself we get 154. The product of the digits of that number is 49. What is the number?

**A**

77.

**B**

78.

**C**

76.

**D**

79.

**Soln.**

**Ans: a**

Let the number be ab. When it is reversed and added to itself we get (10a + b) + (10b + a) = 11 × (a + b). We are given 154 = 11 × (a + b) ⇒ $a + b = 154 / 11 = 14$, so the digits are $a$ and $14 - a$. We are given their product as a × (14 - a) = 49, which is a quadratic expression that can be simplified to $(a - 7) × (7 - a) = 0$. So the number could be 77 or 77.

### Question 5

A number is multiplied by 3, then 13 is added to it. The result remains the same if 13 is multiplied to the number and then 67 subtracted. What is the number?

### More Chapters | See All...

Decimal Numbers | Stocks and Shares | Compound Interest | Time and Work | Areas | Statements and Conclusions | Simple Interest | Problems on Trains | Mirror Images | Paper Folding | More...

This Blog Post/Article "Problems on Numbers Quiz Set 007" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2020-01-21. Published on: 2016-05-13