RRB NTPC Mains or Stage 2 Model Paper 8 with solutions

Question : 31 of 120

Marks: +1, -0

Populations of two villages X and Y are in the ratio of 5 : 7 respectively. If the population of village Y increases by 25000 and the population of village X remains unchanged the respective ratio of their populations becomes 25 : 36. What is the population of village X?

6,25,000
6,75,000
8,75,000
9,00,000

Validate

Solution:

(a) Let the population of the village X be 5x. and that of village Y = 7x.
According to the question,

{5x} /{7x +25000}=25/ 36

⇒ 180 x = 175x + 25 × 25000⇒ 5x = 625000

∴ x = 625000

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