Let the additional kilometres be x and find out the value of x and then add 1 to it for the first km.

Move all the digit of R.H.S on L.H.S one by one by changing sign and get the value of variable.

Let the angles be 7x, 6x, 3x, 2x. Take the sum of total angles to be 360.

Let the angles be 7x, 6x, 3x, 2x. Take the sum of total angles to be 360.

Form the equation and then solve it by transpose method.

Take Nehas age as x and Ushas age as x+20. Then form the equation.

Let the breadth be x, form a equation and then solve it. Perimeter is total sum of all the sides

Let the largest side is x, then form an equation and find the value of x. Perimeter is sum of all the sides.

Assume the runs scored in 3rd match is x and then create and solve the equation.