Divide 13.680 in three parts such that 1st part is 3/5 th of the third part and the ratio between 2 nd and 3 rd part is 4 : 7. How much is the first part?

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RRB Non Technical Exam (Secunderabad) 2016 click here to view all questions

Divide 13.680 in three parts such that 1st part is 3/5 th of the third part and the ratio between 2 nd and 3 rd part is 4 : 7. How much is the first part?

A3780

B6300

C3600

D4800

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Correct answer is: 3780 Explanation: Let the 3rd part be ‘x’. $⇒\text{ 1st part} = \frac{3x}{5}$ $⇒ \text{2nd part} = \frac{4x}{7}$ $13680 = \frac{3x}{5} + \frac{4x}{7} + x$ $⇒ 13680 = \frac{76x}{35}$ ⇒ x = 6300 $\text{1st part} = 3 \times \frac{6300}{5} = 3780$ ∴ The first part = 3780 rahul ? answered Jan 13 '2020 at 22:30 All Comments

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