The ratio of the number of red balls to blue balls in a box is 5:4. If there are 20 blue balls, how many red balls are there? A. 25 B. 30 C. 35 D. 40 相关知识点: 试题来源: 解析 A。因为红、蓝球比例是 5:4,有 20 个蓝球,设红球有 x 个,5/4 = x/20,解得 x = 25。
In a math competition, the ratio of the number of boys to girls is 3:2. If there are 30 boys, how many girls are there? A. 10 B. 20 C. 30 D. 40 相关知识点: 试题来源: 解析 B。解析:因为男孩和女孩的人数比是 3:2,设女孩人数为 x,30:x = 3:2,通过交叉相乘可得 3x = 60,...
The ratio of the number of students who like math to those who like science is 3:2. If there are 30 students who like math, how many students like science? A. 20 B. 25 C. 35 D. 40 相关知识点: 试题来源: 解析 A。设喜欢科学的学生有 x 人,因为喜欢数学和喜欢科学的学生比例是 ...
. Then, the teacher gave 10 pencils to Sam. Now, the ratio of the number of pencils of Sam to that of Tom is 3 : 5. Sam had pencils at the beginning. 相关知识点: 试题来源: 解析 50 Because the number of pencils that Tom has is unchanged, 1 : 2 = 5 : 10. 3 : 5 ...
The ratio of the number of days in a week to the number of days in a weekend is? A. 7:2 B. 5:2 C. 2:5 D. 2:7 相关知识点: 试题来源: 解析 A。一周有 7 天,周末有 2 天,所以比例为 7:2。选项 B、C、D 错误。反馈 收藏 ...
The ratio of the number of potatoes Samuel had to the number of potatoes Timmy had was 9:4. The ratio of the number of potatoes Samuel had to the number of potatoes Jim had was 6:7. Jim had 195 potatoes more than Timmy. How many potatoes did Samuel and Timmy have in total? A. ...
(英文的)The ratio of the number of boys to the number of girls is 3:2.Thereare 15 boys .How many girls are there? 答案 男生数与女生数之比是3:2.有15个男生,那么有多少个女生?15/3*2=10相关推荐 1(英文的)The ratio of the number of boys to the number of girls is 3:2.Thereare ...
1The ratio between the students in two fifth-grade classes, A and B was 3:2. After Class A sent three students to Class B, their ratio changed to 4:3. How many students were originally in each class? 2【题目】T he ratio of the number of students in two classes,A and B, was 3...
The ratio of the number of red beads on a chain to the number of yellow beads is the same as the ratio of the number of yellow beads to the number of blue beads. There are 30 more blue beads than red ones. How many red beads could be on the chain?
5 In a company, the ratio of the number of men to the number of women is 3: 240% of the men are under the age of 2510% of the women are under the age of 25What percentage of all the people in the company are under the age of 25?28.% ...