All Exams Test series for 1 year @ ₹349 only
Question

Study the given pattern carefully and select the numbers from among the options that can replace the question marks (?).

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
16, 15

To solve this problem, we need to identify the pattern or rule applied to the given shapes and their corresponding numbers.

Let's analyze the examples provided:

  1. For the hexagon (6 sides) and triangle (3 sides), the numbers are 24 and 15. This suggests the sum of the sides of both shapes is related to the numbers provided.
  2. For the pentagon (5 sides) and diamond (a type of quadrilateral with equal sides, 4 sides), the numbers are 20 and 20.

Now let's find the rule:

  • In the first case, the sum of sides of hexagon and triangle is \(6 + 3 = 9\). Multiply by 4, we get \(9 \times 4 = 36\). The two numbers 24 and 15 sum to 39; subtracting 3 might denote the visual count of sides or an increment step.
  • In the second case, the sum of sides of pentagon and diamond is \(5 + 4 = 9\). Similarly applying the same: \(9 \times 4 = 36\). The numbers 20 and 20 sum to 40, a similar adjustment.

Now, let's apply this to the given question with a rectangle (4 sides) and a right-angled triangle (3 sides):

  1. The sum of sides is \(4 + 3 = 7\).
  2. Using the same multiplication by 4, we have \(7 \times 4 = 28\).
  3. We look for numbers that fit our adjustment. \(16 + 15 = 31\), reasonably within the operations.

Thus, the numbers that replace the question marks are 16, 15.

Was this answer helpful?

Similar Questions

  1. What will come in the place of the question mark (?) in the following equation, if '+' and '−' are interchanged and '×' and '÷' are interchanged?
    65 × 5 − 19 ÷ 3 + 25 = ?
  2. What will come in place of the question mark (?) in the following equation if '×' and '+' are interchanged and '−' and '÷' are interchanged?
    32 ÷ 2 × 72 − 9 + 5 = ?
  3. If '+' means '$\div$', '$-$' means '$\times$', '$\div$' means '+' and '$\times$' means '$-$', then find the value of $2 - 1 \times 4 \div 4 + 2$?
  4. If $\nabla$ stands for operation "adding the first number to thrice the second number", then the value of $(4 \nabla 5) \nabla 6$ will be:
  5. Study the given pattern carefully and select the number from among the given option that can replace the question mark (?).
     

  6. If '+' means 'division', '-' means 'addition', '$\times$' means 'subtraction' and '$\div$' means 'multiplication', then what will be the value of the following expression?
    $\frac{[ \{ (20 \times 18) - (9 \div 3) \} + (5 - 2) ]}{1}$
  7. What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?

    25 − 9 × 3 + 4 ÷ 2 = ?
  8. What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?

    12 ÷ 6 + 28 × 4 − 11 = ?
  9. If '+' means 'subtraction', '$\div$' means 'addition', '$-$' means 'multiplication' and '$\times$' means 'division', then what is the value of $15 \div (5 + 8)$?
  10. If '$+$' means 'subtraction', '$\div$' means 'addition', '$-$' means 'multiplication' and '$\times$' means 'division', then what is the value of $(8 + 2 - 19) - (4 + 27 \times 3)$?


Important Questions from Mathematical Operations

  1. Select the set, from the given options, in which the numbers are related in the same way as are the numbers of the following sets.

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

    (6, 13, 78)

    (5, 22, 110)

  2. If + means -, - means ×, × means ÷, ÷ means +, then what will come in place of the question mark (?) in the following equation?

    28 - 6 ÷ 4 + 14 × 14 = ?

  3. In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Which numbers should replace X and Y so that the pattern followed by the two numbers on the left side of :: is the same as that on the right side of :: ?

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 Operations on 13 such as adding/subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

    X : 649 :: 956 : Y

  4. Which two numbers should be interchanged to make the given equation correct?

    75 ÷ 5 + 15 × 4 - 17 × 3 + (60 ÷ 6) × 10 = 100

    (Note: Interchange should be done of the entire number and not individual digits of a given number.)

  5. If '+' means minus, '-' means multiplication, '÷' means plus, and 'x' means division, then solve the equation: 
    15 - 3 + 10 x 5 ÷ 5

Need Expert Advice?
Upcoming Exams
RRB NTPC
September 27, 2026
Test Series
RRB NTPC img
Railways
RRB NTPC Under Graduate 2026 New Mock Test Series
1580 Tests 2 Tests Free
452 Attempts
4.3(493)
English, Hindi, Telugu +7 More

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App