If someone can help me ASAP please and thank you

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Acompany produces packets of soap powder labeled “giant size 32 ounces.” the actual weight of soap powder in such a box has a normal distribution with a mean of 33 oz and a standard deviation of 0.7 oz. to avoid having dissatisfied customers, the company says a box of soap is considered underweight if it weighs less than 32 oz. to avoid losing money, it labels the top 5% (the heaviest 5%) overweight. how heavy does a box have to be for it to be labeled overweight?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2