Final answer:
Leo had 90 colored pencils and gave away 8 packages to his 4 friends, which means he gave away 80 colored pencils. Subtracting the number he gave away from the total, he should have kept 10 colored pencils, which is not reflected in the provided options.
Step-by-step explanation:
Leo originally had 9 packages of colored pencils, with each package containing 10 colored pencils. This means he had a total of 90 colored pencils (9 packages × 10 colored pencils per package). He gave away 4 friends × 2 packages each, which equals 8 packages. Since each package contains 10 colored pencils, he gave away 80 colored pencils (8 packages × 10 colored pencils per package). By subtracting the number of colored pencils he gave away from the total, 90 - 80, we find that Leo kept 10 colored pencils.
However, this does not match any of the answer choices provided which suggests there may be an error in the options given. The closest correct option, based on this calculation, would be (C) Leo kept 20 colored pencils, but since our calculation gives us 10, we should verify the details of the question to ensure accuracy before making a final decision.