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Rajesh has a mobile shop at Nehru Place in which there are only two brands, Samsung and Nokia. Ramesh went to Rajesh's shop and bought 10 Samsung phones and 15 Nokia phones which cost him Rs 1,75,000 while Ramesh's brother Rakesh bought 15 Samsung phones and 10 Nokia phones which cost him Rs 2,00,000. The cost of one Nokia phone is
1. Rs 10,000
2. Rs 15,000
3. Rs 5,000
4. Rs 12,000

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Correct Answer - Option 3 : Rs 5,000

Given:

Cost of 10 Samsung phones + Cost of 15 Nokia phones = Rs 175000

Cost of 15 Samsung phones + Cost of 10 Nokia phones = Rs 200000

Calculation:

Let Samsung phone be denoted by S and Nokia phone be denoted by N.

10S + 15N = 175000      ---- (1)

15S + 10N = 200000      ---- (2)

Subtracting (1) from (2), we get

5S - 5N = 25000

⇒ S - N = 5000      ---- (3)

Multiplying equation (3) with 10 and adding to (2), we get

25S = 250000

⇒ S = 10000

Putting value of S in equation (3), we get

10000 - N = 5000

⇒ N = 5000

∴ The value of one Nokia phone is Rs 5000

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