Table shows the number of persons in six cities A to F in 2020, with the male:female and literate:illiterate ratios.

City	Persons	M:F	Literate:Illiterate
A	500000	3:2	1:4
B	360000	4:6	4:1
C	280000	3:4	2:5
D	450000	5:4	3:2
E	500000	2:3	2:3
F	300000	2:1	7:3

The ratio of the number of literates in City F to that in City A is

A3:5

B2:5

C21:10 ✓ Correct

D8:3

Correct answer: (C) 21:10

Explanation

The ratio is 21 to 10, so the answer is 21 to 10.

City F has 3,00,000 persons with a literate-to-illiterate ratio 7:3.

So its literates are 7 of 10 parts of 3,00,000, which is 2,10,000.

City A has 5,00,000 persons with a literate-to-illiterate ratio 1:4.

So its literates are 1 of 5 parts of 5,00,000, which is 1,00,000.

The ratio of the two is 2,10,000 to 1,00,000.

Dividing both by 10,000 gives 21 to 10.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.