Do You See It?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

What is wrong in the below Picture?

People make me, save me, change me, raise me. What am I?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

Which English verb becomes past tense just by rearranging the letters?

Why 1729 is a magic number? Answer Logically.

Until it is measured, not known. Yet how you miss it when it has gone. What is it?