【GRE数学】How many positive integers less than 20 are equal to the sum of a positive multipleHow 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

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【GRE数学】Howmanypositiveintegerslessthan20areequaltothesumofapositivemultipleHowmanypositiveintegersle

【GRE数学】How many positive integers less than 20 are equal to the sum of a positive multipleHow 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
【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

【GRE数学】How many positive integers less than 20 are equal to the sum of a positive multipleHow 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

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