GWD20-17,20-33

ruoshany

Q17:

How many prime numbers between 1 and 100 are factors of 7,150 ?

 

A.     One

B.     Two

C.     Three

D.     Four

E.      Five

这题答案是D 可我只算出3个质数1,2,5另一个是什么??

Q33:

At Company X senior sales representatives visit the home office once every 30 days, and junior sales representatives visit the home office once every 20 days.  The number of visits that a junior sales representative makes in a 2-year period is approximately what percent greater than the number of visits that a senior representative makes in the same period?

 

A.     10%

B.     25%

C.     33%

D.     50%

E.       67%

答案是D

falconcn

Q17: 7150=13 x 11 x (5^2) x 2, 所以有13，11，5，2 这4个质因数；注意1不是质数；

Q33：number of visits of junior = 365*2 / 20=36.5, number of visits of senior =365*2 / 30 = 24.3, (36.5-24.3)/24.3=50.2%

ruoshany

thx