{7x of 5 + 7Y of 5 = 210 {7x of 5 × 0.8 + 7Y of 5 × 0.8}
7x / 5 + 7Y / 5 = 210
7(x+y)=5*210
x+y=150
5 / 7X × 0.8 + 5 / 7Y × 0.9 =?
0.56x+0.63y=5?
0.56(x+y)+0.7y=5?
0.56*150+0.7y=5?
0.7y=5?-84
RELATED INFORMATIONS
- 1. 4X (3.4x) = 18.8, acute
- 2. How to solve the equation 6x + 4 = 8x-4,
- 3. There are four numbers in an equal ratio sequence. Subtract 1,1,4,13 from the four numbers to form an equal difference sequence. Then the four numbers are ()
- 4. In △ ABC, ab = AC, the perpendicular of AB intersects AC at F. if AB = 12cm and the perimeter of △ BCF is 20cm, then the perimeter of △ ABC is (process)
- 5. Given that the square matrix satisfies a ^ 2-2a + 2E = 0, it is proved that a and a-3e are invertible, and the inverse matrices of a and a-3e are obtained
- 6. What does stainless steel 304316304l or 306l mean?
- 7. The square root of 1.21 × 104
- 8. Solve the following binary linear equations 6x + 7Y = 20,7x + 6y = 19 and write the detailed points
- 9. Equation: 4x-10 = 7X-22
- 10. 6X + 8x = 14 to solve the equation
- 11. If the square root of a + B + 1 and | A-B + 2 | are opposite to each other, find the cube of 22a-2b + 7 There should be a process
- 12. Difference of 201 202 304 stainless steel I want to know their uses, materials and prices,
- 13. Let a square matrix of order n satisfy the square of a - 5A + 7e = 0, prove that 3e-a is invertible, and find the inverse matrix of (3a-e)
- 14. In the isosceles triangle ABC, ab = AC = 12cm, De is the vertical bisector of the waist AB, de intersects AB to D, BC to e, and BC = 20cm
- 15. There are four numbers in the equal ratio sequence. Subtract 1,1,4,13 from these four numbers respectively, and then they will become the equal difference sequence again. Find these four numbers
- 16. Let a square matrix of order n satisfy a ^ 2-3a + 3E = 0, prove that a-2e is invertible, and find its inverse matrix?
- 17. If a is a square matrix of order n and AAT = e, | a | = - 1, it is proved that | a + e | = 0, where e is the identity matrix
- 18. If a is a square matrix of order n and AAT = e, | a | = - 1, it is proved that | a + I | = 0, where I is the identity matrix
- 19. Let a be a square matrix of order n and satisfy a ^ 2-3a + 2E = 0, it is proved that the eigenvalue of a can only be 1 or 2
- 20. 4. Let the four eigenvalues of a square matrix of order 4 be 3,1,1,2, then | a|=