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人気のある Word Problems >

A mother is currently 10 times older than her son. In 4 years time, she will be 7 times older than her son. Use 置換 to find answer.

解

A m o t h er i s c u rre n tl y 10 t im es o l d er t han h er so n . I n 4 ye a rs t im e, s h e w i ll b e 7 t im es o l d er t han h er so n . U se s u b s t i t u t i o n t o f in d an s w er .

解

Boy^{'} s age is : 8

Mother^{'} s age is : 80

解答ステップ

Translate the problem into an equation:

10 x + 4 = 7 (x + 4)

x

を解く

10 x + 4 = 7 (x + 4) : x = 8

発見する age

Boy^{'} s age is : 8

Mother^{'} s age is : 80

人気の例

21.Pamela is 14 years younger than Jiri. The sum of their ages is 30. What is Jiri's age?Nabria’s age is 8 years less than 5 times her brother’s age. Nabria’s age is 10 minus her brother’s age. How old is Nabria?Kevin is 3 times as old as Daniel. 4 years ago, Kevin was 5 times as old as Daniel.How old is Daniel now?A man is four times as old as his son. Six years ago the man was ten times as old as his son.Tyler is nine years older than his sister Tina. Twelve years ago, Tyler was four times as old as Tina. Find their ages now.