30% : 2/5 - 2/3 pakai cara tolong Bah plis

30% : 2/5 - 2/3

= 30/100 : 2/5 - 2/3

= ( 3/10 : 2/5 ) - 2/3

= 3/10 × 5/2 - 2/3

= 15/20 - 2/3

= 3/4 - 2/3

= ( 9 - 8 )/12

= 1/12

30% : 2/5 - 2/3
= 30/100 x 5/2 - ⅔
= 150/200 - ⅔
= (150:50)/(200:50) - ⅔
= ¾ - ⅔
= (3x3 - 2x4)/(4x3)
= (9-8)/12
= 1/12