【GRE数学】How many positive integers less than 20 are equal to

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【GRE数学】How many positive integers less than 20 are equal to the sum of a positive multiple
How many positive integers less than 20 are equal to the sum of a positive multiple of 3 and a positive multiple of
选项：2;5;7;10;19

10个题目是有多少个比20小的整数能够写成3x+4y形式?其中x、y为整数 7,10,11,13,14,15,16,17,18,19

【GRE数学】How many positive integers less than 20 are equal to 不太清楚,How many positive integers less than 1000 are multiples How many positive integers less than 1000 are multiples of 5 Of the two-digit positive integers less than 20 how many hav How many positive integers greater then 5 and less than 500 how many positive even integers less than 1000 can be made u How many positive even perfect cubes are less than 2008? All the positive integers less than 49 are multiplied togeth GRE数学：If r and s are positive integers,each greater than 1,a How many four-digit positive integers are there with thousan 一道sat数学题how many integers greater than 20 and less than 30 a if a,b,and c are distinct positive odd integers less than 6,