Rahul’s age is three times the age of Sumit. If Rahul is 15 years old presently, determine the age (in years) of Sumit after 12 years. 

If ‘+’ means ‘-‘; ‘-‘ means ‘×’; ‘×’ means ‘÷’ and ‘÷’ means ‘+’, then
25×5÷30+8 – 2 =?

Select the correct set of symbols:
34  16  4  12  = 26

In the following questions, correct the equation by interchanging two signs.
9 × 3 + 8 ÷ 4 – 7= 28

If ‘+’ stands for division, ÷ stands for multiplication, multiplication stands for addition; then which one of the following equation is correct?

In a school, the bell is rung once after each half an hour. The school starts at 8:00 a.m. and closes at 1: 30 p.m. The bell is rung 3 times continuously, at the time of beginning, at the time of lunch break at 10:00 and 10:30 a.m. and at the end. How many times is the bell rung every day? 

Ashok's mother was 3 times as old as Ashok 5 years ago. After 5 years she will be twice as old as Ashok. How old is Ashok today?