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Question

# If 70% of a number is reduced from itself it reduces to 81. What is two-third of that number? यदि किसी संख्या का 70% इस संख्या में से घटाया जाता है तो यह घटकर 81 हो जाता है, तो उस संख्या का दो-तिहाई क्या है?

A
175
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B
179
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C
180
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D
183
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Solution

## The correct option is C 180Let the number be p. Then p – 70 % of p = 81 ⇒ p – 70/100 × p = 81 ⇒ p– 0.7p = 81 ⇒ 0.3p = 81 ⇒ p = 81/0.3 ⇒ p = 270 Now, we need to find 2p/3 = 2 × 270 / 3 = 2 × 90 = 180 माना कि संख्या p है। p का p – 70 % = 81 p – 70/100 × p = 81 ⇒ p– 0.7p = 81 0.3p = 81 p = 81/0.3 p = 270 अतः संख्या का दो-तिहाई 2p/3 = 2 × 270 / 3 = 2 × 90 = 180

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