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I,  Leave me out  ( Loại chữ cái thừa)

Lưu ý đáp án điền chữ thường không in hoa.

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The average score obtained by a group of students in an English test was 92. Among the students, the boys scored an average of 90 and the girls scored an average of 93.5. How many boys were there if there were 20 girls ? 

Four children take turns to weight themselves in pairs. All the six readings of the total weight of every two children are recorded as follows: 

39     34     38    38        42       37

What is the average weight of the four children ? 

An's average score for four tests is 68. What should his score be for fifth test if he wishes to have an average score of 72 for all five test ?

The scores of four students in a mathematics test are 79, 83, 92 and 80. Aureila's score is 6 more than the average score of the four students and her score. What is Aureila's score in the mathematics test ?

The average of eight numbers is 29. The average of the first five numbers is 26. The average of the last four numbers is 31. Find the fifth number ? 

200 new books are distributed to three libraries. Library A receives 15 more books than Library B. Library B receives 25 more books than Library C. How many new books are there in each library ?

Lincoln is 11 years old and his mother is 41 years old. How many years old was his mother's age seven times that of Lincoln ? 

The total age of Elisa and her father is 48. Four years ago, her father's age was 7 times that of Elisa. How old is Elisa now ? 

Four years ago, the total age of Anne and her father was 37. Her father's age is four times that of Anne now. How old is Anne's father now ?

Jack and his brother had 550 dollars altogether. Jack spent 60 dollars and his brother spent 30 dollars more than his brother in the end. How much money had Jack at first ?

Rose is 8 years old. Her father is 34 years old. When will her father be thrice her age ?

There were 72 students in Class 3A and Class 3B altogether. If 2 students were transferred from class 3B to class 3A, Class 3A would have 8 more students than Class 3B. How many students were there in Class 3B at first ? 

The sum of Ryan, Julian and Belinda's age is 80 years. When will the sum of their age be 95 ?