Reading the book Brilliant mathematics

Logic Level 1

Lisa and Bart are reading the book Brilliant Mathematics. At a certain moment the following conversation was given:

  • Lisa said: "I still need to read 40% of the book."
  • Bart replied: "Then I have read half of what you have read."

What percentage of the book does Bart need to read?

80% 70% 20% 60% 40%

Ronald Chén by Ronald Chén , 32, Guatemala

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2 solutions

Blan Morrison
Dec 20, 2017

If Lisa has 40% left, that means that she has read 60% already. If Bart has read half of what Lisa has read, that means that he has read 60 2 \frac{60}{2} %, or 30%. To calculate remaining percentage, we simply subtract 30% from 100% to get 70% .

2 Helpful 0 Interesting 0 Brilliant 0 Confused

Lisa needs to read 40%, so 60% is read, so Bart has read 30%, and needs to read 70%.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

@Brilliant Mathematics , I want that book!

Vinayak Srivastava - 10 months, 3 weeks ago

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no book only a problem

NSCS 747 - 8 months, 3 weeks ago

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