Linear Equation...

The sum of two numbers is 72. if one number is double the other find the numbers.

The sum of three consecutive integers is 72. What is the sum of the squares of the first number and the last number? 

On increasing the salary of a man by $$25\%$$, it becomes $$Rs. 20000$$. What was his original salary?

The sum of three consecutive multiples of $$7$$ is $$357$$. Find the smallest multiple.

The digit in the ten's place of a two-digit number is $$3$$ more than the digit in the units place. Let the digit at the unit's place be $$b$$. Then the number is

Linear equation in one variable has

A linear equation in one variable has

If the mean of $$5, 7, 9, x $$ is $$9$$ then the value of $$ x $$ is

A container is $$\dfrac{1}{8}$$ full of water. After $$10$$ cups of water are added, the container is $$\dfrac{3}{4}$$ full. What is the volume of the container, in cups?

Lakshmi is a cashier in a bank. She has notes of denomination of Rs. 20, Rs. 10 and Rs. 5. The ratio of number of these notes is $$1 : 2 : 3$$. The total cash with Lakshmi is Rs. $$1100$$. How many notes of Rs. $$20$$ denomination does she have?