zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的 >

Bill is four times as old as Lily. Two years from now, Bill will be nine times as old as Lily was two years ago. Find their present ages.

解答

Bill is four times as old as Lily. Two years from now, Bill will be nine times as old as Lily was two years ago. Find their present ages.

解答

Lily^{'} s age is : 4

Bill^{'} s age is : 16

求解步骤

Translate the problem into an equation:

4 x + 2 = 9 (x - 2)

求解

x, 4 x + 2 = 9 (x - 2) : x = 4

找到 age

Lily^{'} s age is : 4

Bill^{'} s age is : 16

流行的例子

The radius of a circle is 19 in. Find its 周长 in terms of pipi.The 半径 of a circle is 5 ft. Find its area in terms of pipi.The 面积 of the square pool on Mr. Carr's vacation was 225 ft2. How long was one side of the pool?Two times the sum of a number and 3 equals 4 A number is six times another number. Their sum is 28. What are the numbers?