Fill in the blanks to make the statements true:

If 45 persons can complete a work in 20 days, then the time taken by 75 persons will be ………… hours.

Fill in the blanks to make the statements true:

In case of inverse proportion, .

Fill in the blanks to make the statements true:

If the area occupied by 15 postal stamps is 60 cm², then the area occupied by 120 such postal stamps will be…………...

Fill in the blanks to make the statements true:

Devangi travels 50 m distance in 75 steps, then the distance travelled in 375 steps is ………. Km.

State whether the statements are true (T) or false (F).

Two quantities x and y are said to vary directly with each other it for some rational number k, xy = k.