The number of students dropping out of school last year was m. Number of students dropping out of school this year is m – 30.

John planted ‘t’ plants last year. His friend Jay planted 2t + 10 plants that year.

Sharad used to take p cups tea a day. After having some health problem, he takes p – 5 cups of tea a day.

Price of petrol was Rs p per litre last month. Price of petrol now is Rs (p – 5) per litre.

Khader’s monthly salary was Rs P in the year 2005. His salary in

2006 was Rs (P + 1000).