Question

(920-x)÷20+25=63 и (150÷y+7)×40=480

Answer 1

(920 - х) : 20 + 25 = 63

(920 - х) : 20 = 63 - 25

(920 - х) : 20 = 38

920 - х = 38 * 20

920 - х = 760

х = 920 - 760

х = 160

- - - - - - - - - - - -

(150 : у + 7) * 40 = 480

150 : у + 7 = 480 : 40

150 : у + 7 = 12

150 : у = 12 - 7

150 : у = 5

у = 150 : 5

у = 30

Answer 2

To solve the equations, we need to find the values of 'x' and 'y' that satisfy them. Let's solve each equation step-by-step:

1. (920 - x) ÷ 20 + 25 = 63

Step 1: Simplify the expression on the left side.

(920 - x) ÷ 20 + 25 = (920 ÷ 20 - x ÷ 20) + 25 = (46 - 0.05x) + 25

Step 2: Combine like terms.

(46 - 0.05x) + 25 = 46 + 25 - 0.05x = 71 - 0.05x

Now, the equation becomes:

71 - 0.05x = 63

Step 3: Isolate 'x' on one side of the equation.

Subtract 71 from both sides:

-0.05x = 63 - 71 -0.05x = -8

Step 4: Solve for 'x'.

Divide by -0.05 on both sides:

x = -8 / -0.05 x = 160

So, the solution for 'x' is x = 160.

2. (150 ÷ y + 7) × 40 = 480

Step 1: Simplify the expression inside the parentheses.

(150 ÷ y + 7) × 40 = (150 ÷ y + 7) × 40

Step 2: Distribute the multiplication.

(150 ÷ y + 7) × 40 = 40 × (150 ÷ y) + 40 × 7

Step 3: Simplify further.

40 × (150 ÷ y) + 40 × 7 = 6000 ÷ y + 280

Now, the equation becomes:

6000 ÷ y + 280 = 480

Step 4: Isolate 'y' on one side of the equation.

Subtract 280 from both sides:

6000 ÷ y = 480 - 280 6000 ÷ y = 200

Step 5: Solve for 'y'.

Divide by 200 on both sides:

y = 6000 / 200 y = 30

So, the solution for 'y' is y = 30.

To summarize: x = 160 y = 30