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?

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

What does this rebus means ?

PROG WORKRESS

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

How can you make number one disappear by adding something to it?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

When we see 2 but call 10?

Look at the picture and find out which square is not linked with any of the other squares.

When is the top of a mountain similar to a savings account?