Can you replace the question mark with the correct number?

What goes up but never comes down?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Count the number of lines in the image below ?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What has 88 keys?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

What does below Rebus mean ?

esgg sgeg gegs gsge

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

What is next number in the pattern below:

131 517 192 123 ?