答一斤肉放0.2两盐,8斤肉放一斤六两盐,因为一斤肉要放零点二两盐,二斤肉要放零点四两盐,三斤肉要放零点六两盐,四斤肉要放零点八两盐,五斤肉要放一斤盐了,六斤肉要放一斤二两盐,七斤肉要放一斤四两盐,八斤肉要放一斤六两盐,所以说八斤肉要放一斤六两盐。