Question

calcule x e y a b ec ????

Answer 1

a) x / 30 - x = 8/12

12 * x = 8 * (30 - x)

12x = 240 - 8x

12x + 8x = 240

20x = 240

x = 240/20

x = 12

12/y = 8/12

8 * y = 12 * 12

8y = 144

y = 144/8

y = 18

b) 3/2 = x / 15-x

2 * x = 3 * (15 - x)

2x = 45 - 3x

2x + 3x = 45

5x = 45

x = 45/5

x = 9

3/2 = 9/y

3 * y = 2 * 9

3y = 18

y = 18/3

y = 6

c) x / 18 - x = 4 / 5

5 * x = 4 * (18 - x)

5x = 72 - 4x

5x + 4x = 72

9x = 72

x = 72 / 9

x = 8

x + y = 18

8 + y = 18

x = 18 - 8

x = 10