en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

mark is 4 times as old as johnny. in 20 years mark will be twice as old as johnny find the present age of both

Solution

mark is 4 times as old as johnny. in 20 years mark will be twice as old as johnny find the present age of both

Solution

Johnny^{'} s age is : 10

Mark^{'} s age is : 40

Solution steps

Translate the problem into an equation:

4 x + 20 = 2 (x + 20)

Solve for

x, 4 x + 20 = 2 (x + 20) : x = 10

Find age

Johnny^{'} s age is : 10

Mark^{'} s age is : 40

Popular Examples

Allie puts 7,982.00 into an account to use for school expenses. The account earns 11.86% interest, compounded monthly. How much will be in the account after 7 years?Olivia invested 500 in an account paying an interest rate of 2.4% compounded continuously. Assuming no deposits or withdrawals are made, how long would it take, to the nearest tenth of a year, for the value of the account to reach 650?The sum of two numbers is 15 and the product of the two numbers is 54.The larger of two numbers is 6 less than four times the smaller number. The sum of the two numbers is 49 What are the numbers? (Use a comma to separate answers as needed.)Zara is one year older than Zantrop, and their age combined is 18. How old are Zantrop and Zara