State whether the given statement is true or false:

If one angle of a triangle is kept fixed then the measure of the remaining two angles vary inversely with each other.

State whether the given statement is true or false:

When two quantities are related in such a manner that, if one increases, the other also increases, then they always vary directly.

State whether the given statement is true or false:

When two quantities are related in such a manner that if one increases and the other decreases, then they always vary inversely.

State whether the given statement is true or false:

If $\mathrm{x}$ varies inversely as $\mathrm{y}$ and when $\mathrm{x}=6, \mathrm{y}=8,$ then for $\mathrm{x}=8$ the value of $\mathrm{y}$ is $10$

State whether the given statement is true or false:

The number of workers and the time to complete a job is a case of direct proportion.

State whether the given statement is true or false:

For fixed time period and rate of interest, the simple interest is directly proportional to the principal.

Which of the following vary directly and which vary inversely with each other and which are neither of the two?

The time taken by a train to cover a fixed distance and the speed of the train.

Which of the following vary directly and which vary inversely with each other and which are neither of the two?

The distance travelled by $\mathrm{CNG}$ bus and the amount of $\mathrm{CNG}$ used.