## Minimum marks in the annual examination

The marks obtained by a student of Class XI in first and second terminal examination are 65 and 42, respectively. Find the minimum marks he should get in the annual examination to have an average of at least 65 marks.

## simultaneous equations using Cramer’s rule

Solve the following simultaneous equations using Cramer’s rule. x+ 2 y + 4 = 0; 3 x = – 4y – 6

## The probability for the ticket drawn

There are 50 tickets numbered from 1 to 50 in a box. A ticket is drawn. What is the probability that the ticket drawn (i) Have an odd number. (ii) Have a number which is a perfect cube.

## Evaluate the determinant

Evaluate the following determinant:

## The original price of oil

Linear and Non-linear Equations In the month of February, Meeta paid Rs. 620 for 5 kg oil and 2 kg “ghee”. In next month she found that price of oil is increased by 10% and of Ghee by 5%, which increase her total expanses on the same amount of oil and ghee by Rs. 46 What was the original price of oil?

## What would be the temperature in degree Fahrenheit?

Linear and Non-linear Equations A thermometer shows temperature in degree Celsius as well as in degree Fahrenheit. The relation between both temperature is given by F = (9/5) C + 32. What would be the temperature in degree Fahrenheit for 30oC?

## How many seconds will it take to come back to the top of the rod!

Integers Fact: Find here: http://www.ipracticemath.com/Learn/BasicMath/TInt An insect crawls up 5 cm every second on a 60 cm vertical rod and then falls down 2 cm over the next second. How many seconds will it take to climb the rod? Note: when insect can come back to the top of the rod!

## How to find mean of numbers?

Mean number of people?   Mean  is a value obtained by dividing the sum of all the values of a variable by the number of values.