300<12k+2<500 => 24.8300<15m+8<500 => 19.412k+2=15m+8 => k=1/2+5m/4其中k,m属于自然数,所以m的取值为4n+2 ,能够取[22 26 30]对应的k值为 [28 33 38]都在范围内,所以共有三种情况,338 398 458
(8-2)÷(1/12-1/15)=6÷1/60=360瓶