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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?


Your Answer
A
175
Your Answer
B
179
Correct Answer
C
180
Your Answer
D
183

Solution

The correct option is D 180
Let 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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