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IAS Interview Question: Fill the Boxes Puzzle
Difficulty Level

Fill the Boxes: [ ] + [ ] + [ ] + [ ] + [ ] = 30

Fill the given five boxes using one of these numbers 1, 3, 5, 7, 9, 11, 13, 15 and make the sum 30. You can also repeat the numbers and also mathematical operators can be used in the boxes

View Answer Comments(14)

Addition of odd numbers for odd times will result always in an odd number. So directly there is no way to get an even number like 30 by adding these odd numbers. There can be multiple answers according to the logic we use.


Answer 1

To get an even number from an odd number the best operation to use would be factorial.

So we use 3!,

3! = 3 x 2 x 1 = 6

so if we add 3! five times we get the answer as 30. (As repetition of the number is allowed.)

Hence the answer would be

3! + 3! + 3! + 3! + 3! = 6 + 6 + 6 + 6 + 6 = 30.


Answer 2

The answer can be
(15-9) + (13-7) + (7-1) + (9-1) + (13-9)

If you calculate it, you will get
6 + 6 + 6 + 8 + 4 = 30.


Answer 3

If you think completely out of the box, then you can find answers like this also
3 weeks + 7 days + 11 hrs + 13 hrs + 1 day = 30 days.

Guest Said:Posted On 2017-06-11

3!+5+5+7+7 6+24=30

Guest Said:Posted On 2017-02-07

7+9+11+3

Guest Said:Posted On 2017-01-06

15+11+5+[-1]

Guest Said:Posted On 2016-12-15

Father

Guest Said:Posted On 2016-11-01

[3]+[3]+[3]+[3]+[3(3+3)] = 30

Guest Said:Posted On 2016-11-01

[3]+[3]+[3]+[3]+[3(3+3)] = 30

Guest Said:Posted On 2016-10-19

(15)+(15)+(1-1)+(1-1)+(1-1)=30.

Guest Said:Posted On 2016-10-19

(15)+(15)+(1-1)+(1-1)+(1-1)=30.

Guest Said:Posted On 2016-05-29

15 15 5 - 5

Guest Said:Posted On 2016-05-17

[3]+[5]+[7]+[15]=30 @mar

Guest Said:Posted On 2016-03-10

simplest answer- [1-1 ] + [1-1 ] + [1-1 ] + [ 15] + [15 ] = 30

Guest Said:Posted On 2016-02-21

[13]+[11]+[9]+[-3]=30

Guest Said:Posted On 2015-12-06

7+7+7+7+(7+7)/7

Guest Said:Posted On 2015-10-14

11+15+9+(-1)+(-1)+(-3) Rajesh :)

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