Get the algebraic expressions in the following cases using variables, constants and arithmetic operations.

Number 5 added to three times the product of numbers m and n.

Find the following percentage value:

1) 15% of 250.

Find the perimeter of the given figure

Find the perimeter of the given figure

Find the angle which is equal to its supplement.

Find the breadth of the rectangle whose length is 70 cm and perimeter 200 cm.

Convert 1 gallon into liters.

a. 3.05 liters

b. 3.78 liters

c. 4.05 liters

d. 4.78 liters