The king and his daughters

Algebra Level 2

Many many years ago , there was a king who has three daughters , each one of them lives in a palace , one day the king wanted to visit his daughter so he took few golden coins and visited the first palace.

in the palace he had to give the guard 10 golden coins when he enters the palace and 10 coins when he leaves and when he meets his daughter she gives him as much as he has .

this process was repeated in the second and third palace

When the king left the third palace and gave the guard 10 coin his pocket got empty.

The question is how much coins the king took when he went to visit his daughters??


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