How to find a volume to a rectangular box

Which of the following transformations will always produce a congruent figure?

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

Afactory buys 10% of its components from suppliers b and the rest from supplier c. it is known that 6% of the components it buys are faulty. of the components brought from suppliers a,9% are faulty and of the components bought from suppliers b, 3% are faulty. find the percentage of components bought from supplier c that are faulty.