1.Suppose each kilogram of pork costs $15 and each kilogram of beef costs $21. If Susan uses $140 to buy 8 kilograms of pork and beef altogrther, how many kilograms of beef does she buy?
2.The number of rotten apples is 3/14 of the total number of apples. If 4 more rotten apples are added, the number of rotten apples will be 1/4 of the total number of apples.How many apples are there originally?
3.Find two consecutive integers such that 3/5 of larger number exceeds 1/4 of the smaller one by 5有2分1.
