Ask three practical questions and answer them as soon as possible 1. There are five numbers, and their average number is 168. If the five numbers are arranged from large to small, the average of the first three numbers is 108, and the average of the last three numbers is 217. What is the number in the middle? 2. The number a is 240, 25% more than the number B. what is the sum of a and B? 3. There is a fraction, the numerator is 13 smaller than the denominator. If the numerator adds 18, the denominator adds 21, and the score value remains unchanged, what is the original fraction?

Ask three practical questions and answer them as soon as possible 1. There are five numbers, and their average number is 168. If the five numbers are arranged from large to small, the average of the first three numbers is 108, and the average of the last three numbers is 217. What is the number in the middle? 2. The number a is 240, 25% more than the number B. what is the sum of a and B? 3. There is a fraction, the numerator is 13 smaller than the denominator. If the numerator adds 18, the denominator adds 21, and the score value remains unchanged, what is the original fraction?

1. Suppose that the five numbers arranged from small to large are X1 x2 X3 X4 X5, taking X1 x2 as a whole Y1, X4 X5 as a whole Y2, then according to the meaning of the question: (Y1 + Y2 + x3) / 5 = 168 (Y1 + x3) / 3 = 108 (Y2 + X3) / 3 = 217, we get X3 = 135
2. A = b * (1 + 0.25) = 240, so B = 192 a + B = 432
3. From the formula: (X-13) / x = (x + 5) / (x + 21), we can get: x = 91, the original score is 78 / 91 = 6 / 7
Attachment: landlord, should the first question be arranged from small to large?