If there are x chairs in a row, then the number of persons that can be seated in 8 rows are

1. 64

2. x + 8

3. 8x

4. none of these

If Arshad earns ₹x per day and spends ₹y per day, then his saving for the month of March is

1. ₹(31x − y)

2. ₹31(x − y)

3. ₹31(x + y)

4. ₹31(y − x)

Rashmi has a sum of ₹x. She spent ₹800 on grocery, ₹600 on clothes and ₹500 on education and received ₹200 as a gift. How much money (in ₹) is left with her?

1. x − 1700

2. x − 1900

3. x + 200

4. x − 2100

For any two integers a and b, which of the following suggests that the operation of addition is commutative?

1. a × b = b × a

2. a + b = b + a

3. a − b = b − a

4. a + b > a