英语翻译给外国小孩做家教遇到不会翻译的题目,(1)72比一个数的2\3少14,求这个数(2)某数的5倍于他的7倍相差12

two-thirds of a number minus 72 leaves 14,what is the number?
a number's septuple minus its quintupling is 12.8,what is the number?
B has 20% less than A,what is the ratio of A to