A century has 100 years, and if Gideon has as many marbles as the number of years in a century, he has 100 marbles.

If he gives 3/4 of the marbles to his sister, he gives out 3/4*100 = <<3/4*100=75>>75 marbles.

Gideon's total number of marbles remaining after giving 3/4 of the marbles to his sister is 100-75=<<100-75=25>>25.

When he multiplies the number of remaining marbles by 2, he gets his age five years from now, meaning he will be 25*2=<<25*2=50>>50 years old five years from now.

Currently, Gideon is 50-5 = <<50-5=45>>45 years old.

# Answer

45
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The total number of years in a century is the same as the number of marbles Gideon has. If he gives 3/4 of the marbles to his sister and multiples the number of remaining marbles by 2, he gets his age five years from now. How old is Gideon now?
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45
The total number of years in a century is the same as the number of marbles Gideon has. If he gives 3/4 of the marbles to his sister and multiples the number of remaining marbles by 2, he gets his age five years from now. How old is Gideon now?
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