Yuki's guppies have begun to have babies. She started with 5 guppies. One week later, Yuki counted twice as many guppies in the fish tank. Each week afterwards, the number of guppies doubled. In how many weeks did Yuki have 160 guppies?

Question

Katrina Rush

Mathematics

26 July, 01:27

Yuki's guppies have begun to have babies. She started with 5 guppies. One week later, Yuki counted twice as many guppies in the fish tank. Each week afterwards, the number of guppies doubled. In how many weeks did Yuki have 160 guppies?

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Answers (1)

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Cameron Mayer · Answer 1

Week 1 = 5 guppies.

week 2 = 5x 2 = 10 guppies

week 3 = 10 x 2 = 20 guppies

week 4 = 20 x 2 = 40 guppies

week 5 = 40 x 2 = 80 guppies

week 6 = 80 x 2 = 160 guppies

Yuki had 160 guppies in 6 weeks.