prep的数学题，不解！不解！！！

1 is the integer n odd?

(1) n is divisible by 3  

 (2) 2n is divisible by twice as many positive integers as n 关键是这句话没有明白

2 total cost=10*8+25h

(1) 25h is at least 150

(2)total cost is less than 260

这题就是想问问at least 是大于等于还是大于

at least 是大于等于

2n is divisible by twice as many positive integers as n

2n正因子的数目 是 n正因子数目的两倍