Explanation:

- Tanzeem's expenditures are divided as follows: on friends (1/5 of salary), on accommodation (1/10 of salary), and on savings (1/4 of salary).

- To find his total expenses, we need to calculate how much of his salary is spent.

- Let's assume the salary is "S". So, the total expenses are: (1/5)S + (1/10)S + (1/4)S.

- Simplify the equation: Convert all terms to a common denominator (20): (4/20)S + (2/20)S + (5/20)S = (11/20)S.

- He has Rs. 1800 left, meaning (9/20)S = 1800. Thus, S = 1800 * (20/9) = Rs. 4000.

- Accommodation and savings: (1/10)S + (1/4)S = (2/20)S + (5/20)S = (7/20)S = 1400.

- Option 2 - 1400 is the correct answer.

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