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GMAT: Math 26

133-137, pg. 170. Created by Sal Khan.

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• For question 135, I solved by multiplying the path choices; 2*2*3=12. Is that was Sal was basically saying to do? I was a little confused by his explanation. Thanks!
• Yea the OG 12th edition uses this method as well.
• Question 137. In problem set up, you state 10 to the 4th minus 10 to the 12th, yet you put 10 to the 2nd in the written example. Which is correct?Also, rather than going through the lengthy process of using the distributive property rule, why not use order of operations and perform the work in the first parenthesis and multiply by the 2nd factor?
• In a family there were x people. The expenditure of rice per month in this family is directly proportional to 5 time the square of number of people in the family. If the elder son left the famiy to stuy in Canada, there was decrease in consumption of 95 kg rice per month. Then the value of x is?
(1 vote)
• Question 137. In problem set up, you state 10 to the 4th minus 10 to the 12th, yet you put 10 to the 2nd in the written example. Which is correct? Also, rather than going through the lengthy process of using the distributive property rule, why not use order of operations and perform the work in the first parenthesis and multiply by the 2nd factor?
• Jim, I tried the work in the parenthesis first, and I got 11.88 which is close to 12, but interesting that it wasn't a straight-forward 12 like Sal got. Just remember that you can't subtract 10^4 - 10^2 straight-up, you've got to factor out 10^2; 10^2(100 - 1) (0.0012)