hitunglah nilay x dan y ! a. ( 5 x - 2 ) : 72 = 18 : 27 b. 8 : 10 = ( y + 15 ) : 25 c. 21 : 28 = 24 : ( 3 y - 4 )

Soal a

(5x - 2) ÷ 72 = 18 ÷ 27

27(5x - 2) = 18 . 72

27(5x - 2) = 1296

(5x - 2) = 48

5x = 50

x = 10

Soal b

8 ÷ 10 = (y + 15) ÷ 25

4 ÷ 5 = (y + 15) ÷ 25

4 = (y + 15) ÷ 5

20 = y + 15

y = 5

Soal c

21 ÷ 28 = 24 ÷ (3y - 4)

7 ÷ 28 = 8 ÷ (3y - 4)

1 ÷ 4 = 8 ÷ (3y - 4)

3y - 4 = 32

3y = 36

y = 12