Question

55:y=77:7. 906-а=206•2

Answer 1

55:y=11
55:11=5

906-a=206•2
906-a=412
a=412

Answer 2

1)55:у=11 У=55:11. У=5 2) 906-а=412. а=906-412. а=494

Answer 3

It seems like you have provided a series of equations. Let's break them down and solve them step-by-step:

1. 55:y = 77:7 This equation is not entirely clear because it lacks an operator between the numbers. Assuming you meant to represent a ratio, it would be written as: $\frac{55}{y} = \frac{77}{7}$

To solve for y, cross-multiply: $55 \times 7 = 77 \times y$ $385 = 77y$

Now, divide both sides by 77 to find y: $y = \frac{385}{77}$ $y = 5$

2. 906 - а = 206 * 2 Let's solve for "а": $906 - а = 206 \times 2$ $906 - а = 412$

Now, isolate "а" by subtracting 906 from both sides: $-а = 412 - 906$ $-а = -494$

Finally, divide both sides by -1 to find "а": $а = \frac{-494}{-1}$ $а = 494$

So, the solutions to the equations are: $y = 5$ and $а = 494$