arrow
arrow
arrow
If 20% of a number is added to 72, then the result is the same number. 70% of the same number is:
Question

If 20% of a number is added to 72, then the result is the same number. 70% of the same number is:

A.

63

B.

83

C.

93

D.

73

Correct option is A

Given:
20% of a number added to 72 results in the number itself.
Solution:
Let the required number be x.
According to the given condition:
20100\frac{20}{100}​ × x + 72 = x
0.2x + 72 = x
72 = x - 0.2x
72 = 0.8x
x = 720.8\frac{72}{0.8}​​
x = 90
Now, we need to find 70% of the same number:
70% = 70100 \frac{70}{100}​ × 90
= 0.7 × 90
= 63
Final Answer
So the correct answer is (a)

Free Tests

Free
Must Attempt

RRB NTPC UG Level PYP (Held on 7 Aug 2025 S1)

languageIcon English
  • pdpQsnIcon100 Questions
  • pdpsheetsIcon100 Marks
  • timerIcon90 Mins
languageIcon English
Free
Must Attempt

CBT-1 Full Mock Test 1

languageIcon English
  • pdpQsnIcon100 Questions
  • pdpsheetsIcon100 Marks
  • timerIcon90 Mins
languageIcon English
Free
Must Attempt

RRB Group D Full Mock Test 1

languageIcon English
  • pdpQsnIcon100 Questions
  • pdpsheetsIcon100 Marks
  • timerIcon90 Mins
languageIcon English
test-prime-package

Access ‘RRB Group D’ Mock Tests with

  • 60000+ Mocks and Previous Year Papers
  • Unlimited Re-Attempts
  • Personalised Report Card
  • 500% Refund on Final Selection
  • Largest Community
students-icon
529k+ students have already unlocked exclusive benefits with Test Prime!
Our Plans
Monthsup-arrow