If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Course: UP Class 8th > Unit 8

Lesson 2: Quadratic equation 8(b)
Math
UP Class 8th
Quadratic equation
Quadratic equation 8(b)
© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Quadratic equations - word problems

Google Classroom

Problem

Sana and Abha had 100 playing cards. Both of them lost 20 cards each. The product of the cards they now have is 900.
How many cards did Abha start with?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi