Lets have a test

Which of the following set of animals have testes located permanently in abdomen ?

Many molluscs have a water-testing organ present in the mantle cavity , this is called

In a test, it is possible to have a negative score. If Krishna's score is 15, what is his new score if he loses 20 points?

In three unit tests of Mathematics Priyal got 75,82 and 90 marks. How many marks must she obtain in Unit test IV to have an average of 85 in the four unit tests?

The marks scored by Rohit in two tests were 65 and 70. Find the minimum marks the should score in the third test to have an average of at least 65 marks.