解答
15 years from now John will be twice as old as Peter.The current sum of the ages of John and Peter is 21.How old is Peter right now?
解答
求解步骤
Translate the problem into an equation:
求解
找到 Peter's age
流行的例子
The 差集 between the square of a number and twice the number is equal to 8.Find both numbers that satisfy the condition above.a pair of standard dice are rolled. find the probability of rolling sum of 4 with these dice.Emmett opened a savings account and deposited 400.00. The account earns 13% interest, compounded continuously. If he wants to use the money to buy a new bicycle in 1 year, how much will he be able to spend on the bike?Steve invests 1,800 in an account that earns 3.7% annual interest, compounded continuously.What is the value of the account after 10 years? Round your answer to the nearest dollar.3 more than 8 times a number