RRB NTPC CBT-1 previous year question
The sum of two positive numbers is 40 and their product is 175. The positive difference between them is:
Asked in RRB NTPC 2026 — 14 June Shift 3 · Quantitative Aptitude
Tap an option to check your answer.
Show answer and explanation
Correct answer: (D) 30
If the two numbers are x and y with x+y=40 and xy=175, then (x-y)2 = (x+y)2−4xy = 1600-700 = 900, so x-y = 30.
हिंदी में प्रश्न
दो धनात्मक संख्याओं का योगफल 40 है और उनका गुणनफल 175 है। उनके बीच का धनात्मक अंतर ज्ञात काजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) 32
यदि दो संख्याएं x और y हैं जहां x+y=40 और xy=175, तो (x-y)2 = (x+y)2−4xy = 1600-700 = 900, अतः x-y = 30 है।
More solved Quantitative Aptitude questions
- A certain sum amounts to ₹5,200 in 2 years and ₹6,400 in 4 years at simple interest. What is the rate of interest per annum?
- The sum of the ages of two siblings is 28 years and the difference of their ages is 8 years. What is the present age of the elder sibling?
- A and B can do a piece of work in 12 days and 24 days, respectively. Both work for 2 days and then A leaves. How long (in days) will B…
- At what annual interest rate will a principal amount of ₹1,000 become ₹1,728 in a period of 1 year and 6 months, assuming that the…
- The largest four-digit number which when divided by 12, 8 and 11 leaves the remainder 3 in each case, is:
- Two trains are moving in opposite directions at speeds of 8 m/s and 10 m/s. If they completely pass each other in 8 seconds, find the…