英语数学题blueheron学校的自助餐厅的收银机显示,123名学生买了意大利面和56个买了蔬菜汤学生买午餐的总数是146。有多少学生同时买了意大利面条和蔬菜汤?thecashregisterintheblueheronschoolc

Question

英语数学题
blue heron学校的自助餐厅的收银机显示,123名学生买了意大利面和56个买了蔬菜汤学生买午餐的总数是146。有多少学生同时买了意大利面条和蔬菜汤?
the cash register in the blue heron school cafeter showed that 123 students bought spaghetti and 56 bought vegetable soup the total number of students who bought lunch was 146.how many students had both spaghetti and vegetable soup?
2.Elsa is 22 years younger than her father. Today, Elsa is half as old as the age of her father four years ago. How old are Elsa and her father?

Answer 1

1. 123+56-146=332. 设Elsa为x岁则 (x+22-4)=2x 解得 x=18 答：Elsa is 18 years old and her father is 40 years old.