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# GMAT: Math 2

7-11, pg. 153. Created by Sal Khan.

## Want to join the conversation?

• Why in #9, after calculating the square root of 0.04, we have to multiply it by 0.2?
• Problem 9 - you arrive at the correct answer and then revert to the incorrect answer in checking your work, no?
• How do I view all the questions before the video plays?
(1 vote)
• how many spaces behind the decimal point would there be if the number the number jumped times equal to the base number.
(1 vote)
• my teachers are making me do this any help?
(1 vote)
• Why can't i look this video?It's always tell me "You've watched 0% of this video".
(1 vote)
• i think in problem 11, have little misstake, the question is : Monday, a customer have 8 packages with avarage is 12 3/8 pound. On tuesday, 4 packages is avarage 8, and 4 packages is 15 1/4 pound. i think the answers is:
((8 x 12 3/8) + (4 x8) + (4x 15 1/4)) divide 16 = 12.
>> Average of both days is 12.
(1 vote)
• From which books are these sums taken from?If there is a reliable book please suggest?
(1 vote)
• I think there might be some problem in question 9...Why do we have to multiply it by 0.2?
(1 vote)
• what tool (program) are you using to record/demonstrate this solution?
(1 vote)