GRE Exam Numerical Ability Area and Volume

A cubical block of metal weighs 1000 gm. How much will another cube of the same metal weigh if its sides are 1.5 times as long ?

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GRE Other Question

n and p are integers greater than 1
5n is the square of a number
75np is the cube of a number.
The smallest value for n + p is In a class of 62 students 41 are taking Spanish, 22 are taking Russian. Of the students taking Spanish or Russian, 10 are taking both courses. How many students are not enrolled in either course?