Question

小学生英语IQ

my brother is two years younger than i ,my sister is four years younger than my brother ,my mother was 20 years old when born. in this year ,the average age of us is 38.can you tell me how old each of us is ?

Answer 1

我弟弟比我小2岁，我妹妹比我弟弟小4岁，我妈生孩子时20岁，今年，我们的平均年龄是38岁，我们各自的年龄是多少？

年龄总和：38*4=152岁

假设我今年x岁
x+x-2+x-2-4+x+20=152
4x+12=152
4x=140
x=35

所以，我今年35岁，弟弟35-2=33岁，妹妹35-2-4=29岁，妈妈35+20=55岁