How to solve 18% (10 + x) = 15% X

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• 1. How to solve the equation of 10x + 6 * (15-x) = 138
• 2. If there is a circle whose radius is a rational number, then its perimeter and area belong to (# 160;) &#A, rational number and rational number &#B. rational number and irrational number &#C. irrational number &#D. irrational number and rational number  
• 3. A school plans to demolish part of the old school buildings and rebuild them into new ones. It takes 80 meters per square meter to demolish the old school buildings and 700 yuan per square meter to build new school buildings. The total area of the old school buildings and new school buildings planned to demolish in the year is 7200 square meters. In the construction process, due to other reasons, the new school buildings only completed 80% of the plan, while the demolition of the old school buildings exceeded 10% of the original plan, Results the area of newly built and demolished school buildings is exactly equal to the original plan (1) Q: what are the areas of the school buildings originally planned to be demolished and newly built? (2) If the remaining part of the original reconstruction fund is used for Campus Greening (the cost of greening is 200 yuan per square meter), how many square meters can be afforested? 19: 30 before the answer and answer in place of additional points
• 4. The value of ∣ m + n ∣ can be obtained by knowing (M + N + 5) (M + N + 5) = 144
• 5. If the square + 1 of the algebraic formula 4 * a plus a monomial form can form a complete square, then; [1] write all possible monomials in line with the meaning of the problem; [2] write all corresponding complete square forms
• 6. There are three points in the triangle (not on the edge), together with the three vertices of the original triangle, a total of six vertices. With these six vertices, we can make all non overlapping triangles. How many are there?
• 7. There are 78 chickens and rabbits. There are 121 feet in total. How many chickens? How many rabbits?
• 8. Olympic math problem urgent! 3. My grandfather is no more than 100 years old. My grandfather's age is five times that of my grandson. After a few years, my grandfather's age will be four times that of my grandson. After a few years, my grandfather's age will be three times that of my grandson. Now my grandfather's age is () years old (Updated) (to be added)
• 9. (1) At the same time of selling books in a bookstore, yiaina book rental business is launched. Each book is rented for no more than 3 days, and the daily rent is a yuan. If the rent exceeds 3 days, an additional B yuan will be charged every day from the fourth day. If a book is rented for 7 days, the rent will be --- yuan (2) , a set of 5 real numbers, please calculate the product of the sum of rational numbers and irrational numbers. (accurate to 0.1) [real numbers are: square of 3, half of root sign, cube of root sign 4, cubic of negative 2 (without brackets), negative root sign 8]  
• 10. The oil import volume of an oil importing and exporting country in recent months has decreased by 15% compared with last month. Due to the rise of international oil price, the cost of oil import in this month has increased by 14% compared with last month. How about the growth rate of oil price in this month compared with last month?
• 11. (15-x): 10 = 17:18
• 12. How to solve this equation 15 △ x = 10
• 13. 18: X / 12 = 3:5, how to set up this equation?
• 14. If the system of equations x − y = 2mx + y = 6 has a nonnegative integer solution, then the positive integer m is () A. 0，1B. 1，3，7C. 0，1，3D. 1，3
• 15. Solve the following equation (1) 40 × 12.5 = (40-x) × 20% (2) 3x (x + 1) - 1 / 3 (x-1) - 1 / 2 (x + 1)
• 16. 6*5+90*5=x
• 17. How to solve the equation x / 50 - (x + 60) / 90 = 2
• 18. 60(x+1)=90(x-1)
• 19. How to solve 18 + x = (48 + x) * 4 / 9
• 20. Bangjie (8x-50) / 3 - (10x + 40) = 10