解
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
解答ステップ
Translate the problem into an equation:
を解く
発見する Peter's age
人気の例
The 差 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