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人気のある Word Problems >

the sum of the ages of a boy and a girl is 18 years. Four years ago the girl was four times the age of the boy. Find the present age of each child.

解

t h e s u m o f t h e a g es o f a b oy an d a g i r l i s 18 ye a rs . F o u r ye a rs a g o t h e g i r l w a s f o u r t im es t h e a g e o f t h e b oy . F in d t h e p rese n t a g e o f e a c h c hi l d .

解

Boy^{'} s age is : 6

Girl^{'} s age is : 12

解答ステップ

Translate the problem into an equation:

18 - x - 4 = 4 (x - 4)

x

を解く

18 - x - 4 = 4 (x - 4) : x = 6

発見する age

Boy^{'} s age is : 6

Girl^{'} s age is : 12

人気の例

Kira went for a drive in her new car. She drove for 1 miles at a speed of 10 mph. For how many hours did she drive?The 差 of twice a number and 7 is 9.74 more than six times a number is 23 less than the product of the same number and 11 the sum of twice a number and five is 11 determined the number The product of a number decreased by 5 and the same number increased by 2 is 8. Find all numbers that satisfy this condition.