Lớp 6A có 42 học sinh. 30 trong số họ tham gia các câu lạc bộ bơi lội và 25 trong số họ tham gia các câu lạc bộ Gymastic. Tất cả học sinh phải là thành viên của ít nhất một câu lạc bộ, tìm số học sinh đã tham gia cả hai câu lạc bộ.
(30-X)+(25-x)=42
=> x=6.5 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Câu 1 :Each of cars can take 8 people. How many cars needed to take 124 people?
Câu 2 : How many integer numbers between 200 and 300 are there for which the hundreds digit equals the sum of the other two digits?
Câu 3 : The average of five numbers is 20. The average of the five number is 18 when one of the numbers is chaned to 4. What is the orginal value of the changed number?
Câu 4 :A book has 250 pages starting at number 1. How many digits are there in the page numbers of the book?
Câu 5 : Find A, if A is 3 less than the average of 48; 55; 29 and A. The value of A is…
Câu 6 : The sum of denominator and numerator of a fraction is 121 and the fraction is equal to 4/7. Find the denominator of the fraction?
Câu 7 : The sum of two numbers is equal to 77. If the first number is multiplied by 8 and the second by 6, the two product are equal. The larger of these numbers is…
Câu 8 : Which is the greatest 2 - digit number divisible by 2, 3 and 4?
Câu 9 : Calculate: (1 + 2/5) x 6/7.
Câu 10 : Give the number sequence: 1, 4, 7, 10, 13, … Find the 15th term of the number sequence.
From 4 letters ab18 one can make all 18 numbers with 4 digits. (In a number, each digit is written only once.) The sum of all 18 possible numbers is 90216. Find a and b.
Toán tiếng anh:
Several different numbers are written on the board. Exactly two them are divisible by 3 and exactly 9 of them are divisible by 13. Let M be the greatest of these numbers. What is the smallest possible value of M?
Edmond was one of 14 athletes in the track - and - field team. They are numbered from 1 to 14. The sum of the numbers of the other 13 is athletes 100.
What is Edmond's number?
what is the largest 3 - digit number so that it has a remainder of 2
when is being divided by 4 and it has a remainder of 4
In order to increase the volume of a cuboid tank , people increase the length of the tank and keep the width nd the height unchanged . The area of the base increase by 75% and the tank can contain 1500 more liters of water . Find the volume of the tank before change?
If the sum of two 2-digit numbers ab and ac and a 1-digit number d is 30, and d>b>c>a. Find ab
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A bag contains green marbles and red marbles only. If the ratio of the number of green marbles to the number of red marbles is 1:4 then ............% of marbles are green.
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