6 men can do a certain piece of work in 15 days. The number of men required to complete the same work in 10 days:

1. 30

2. 25

3. 60

4. 9

If x is in inverse variation with y and x = 4 when y = 6, the value of x when y = 12 is:

1. 2

2. 18

3. 8

4. 12

Assertion (A) : In the following table, p and q are in direct variation.

Reason (R) : If two quantities p and q are in direct variation, then $\dfrac{p}{q}$ is always constant.

1. Both A and R are correct, and R is the correct explanation for A.

2. Both A and R are correct, and R is not the correct explanation for A.

3. A is true, but R is false.

4. A is false, but R is true.

Assertion (A) : If 3 pipes can fill a tank in 6 hours, then 6 pipes will fill the same tank in half the time.

Reason (R) : Time required to complete a certain work = $\dfrac{\text{Work to be completed}}{\text{One day's work}}$.

1. Both A and R are correct, and R is the correct explanation for A.

2. Both A and R are correct, and R is not the correct explanation for A.

3. A is true, but R is false.

4. A is false, but R is true.