If n is an integer, rosenjon's explaination would hold. The answer would be A. But since n is not given to be an integer, per Gsaxton's reasoning, (1) alone is not sufficient. (2) alone is not sufficient along the same lines. But (1) and (2) taken together, are sufficient. Because if both 5n/18 and ...

Two methods to calculate total average speed

In problems that ask you to calculate total average speed, given the speed for onward and return trip, you could apply a formula or a neat trick to get to the answer faster. Lets derive the genral formula first and see how it applies it to couple of examples. Say, a car travels at S1 mph on a trip a...

I do the same. Practise, practise, practise ...

I don't want to cause confusion but just to emphasize that you need to pay careful attention to the overlaps, consider the following example: Question: Workers are grouped by their areas of expertise, and are placed on at least one team. 20 are on the marketing team, 30 are on the sales team, and 40...

awesome tool! Thanks a lot Eric.
-Ashish

Awesome score rbco80301! Good luck with your apps.
-Ashish

thanks for the links jangojess!
-Ashish

(17)^2*(13)^4*(29)*3

Units digit of the product = the product of all digits in units place

Units place of 17^2 = 7*7 = 4(9)
Units place of 13^4 = 3*3*3*3 = 8(1)
Units place of 29*3 = 9*3 = 2(7)

Therefore, units digit of the product = 9*1*7 = 6(3)
Answer = 3