In a bag, black tablet covers and white tablet covers are in the ratio 5 : 9. If there are 450 white tablet covers, how many black tablet covers are there in the bag?
Answer & explanation
Correct answer: option 4
Black cover : White cover
5 : 9
↓
450(given)
9r = 450 or r = 50
Black tablet covers = 5r = 5 x 50 = 250