RRB Group D Number System LCM HCF — practice questions

Explore 4 free Number System LCM HCF questions in RRB Group D Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

Practise Number System LCM HCF with Quill →

Number System LCM HCF questions and exercises with answers

Showing questions 1–4 of 4.

A trader buys 12 oranges for Rs 10 and sells 10 oranges for Rs 12. His profit percent isRead the answer and worked solution →The value of sin 30 degrees + cos 60 degrees isRead the answer and worked solution →Key in the LCM or HCFRead the answer and worked solution →Tap every prime numberRead the answer and worked solution →

Worked practice questions

A trader buys 12 oranges for Rs 10 and sells 10 oranges for Rs 12. His profit percent is

Show answer and solution

Correct answer: D. 44%

CP per orange = 10/12 SP per orange = 12/10. Profit per orange = 12/10 - 10/12 = (144 - 100)/120 = 44/120. Profit% = (44/120) / (10/12) x 100 = (44/120) x (12/10) x 100 = 44%.

Open this question →

The value of sin 30 degrees + cos 60 degrees is

1/2
1
sqrt(3)/2
0

Show answer and solution

Correct answer: B. 1

sin 30 = 1/2; cos 60 = 1/2. Sum = 1.

Open this question →

Key in the LCM or HCF

Read exercise and reference answers

Questions

Answer
12
Question
What is the HCF of 24 and 36?
Answer
72
Question
What is the LCM of 24 and 36?
Answer
72
Question
The HCF of two numbers is 6 and their product is 432. What is their LCM?
Answer
12
Question
What is the smallest number divisible by 2, 3, 4 and 6?

Instructions

Work out each answer and key it in on the pad.

_Source: syllabus Maths Ch1 Real Numbers, 1.2 The Fundamental Theorem of Arithmetic_

Open this exercise →

How to practise

Choose a Number System LCM HCF question and try to work out your answer.
Open the question to check the correct answer and read its worked solution.
Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.