Math formulas are used in everyday life, like when we need a distance formula to determine how much time will it take for a car trip. The simple interest formula to determine the compound interest for a 2 year. Even shopkeepers uses a formula to check the total amount of purchased product. Therefore, it's very important to learn the math formulas. 

Below are some of the commonly used math formulas:

Average Formula = $\frac{a_{1}+a_{2}+.....+a_{n}}{n}$

Proportion Formula = $\frac{a}{b}$ = $\frac{c}{d}$

Interest = principal $\times$ rate of interest $\times$ time

Volume of a box = length $\times$ width $\times$ height

Below are some of the solved problems based on some basic math formulas:

Question 1: Determine the average of the following set of data : 6, 1, 2, 12, 4, 5.
Solution:
Given data: 6, 1, 2, 12, 4, 5

Average of the given data = $\frac{6 + 1 + 2 + 12 + 4 + 5}{6}$ = $\frac{30}{6}$

Average of the given data = 5.

Therefore, 5 is the average of the given set of data.

Question 2: HDFC bank is offering 5% interest on savings account. If the customer deposits an amount of $2500 in the account, what will be the amount of interest in 6 years.
Solution:
Given data:
Principal, P = 2500,
Rate of interest, r = 5%,
Time, t = 6

Interest = principal $\times$ rate of interest $\times$ time
Interest = 2500 $\times$ 0.05 $\times$ 6
Interest = 750

Therefore, the interest is $750 after 6 years.