Question

Choose the correct number in place of '?'
15:25:35:225: :29: 324: :27:?
1) 289
2) 169
3) 361
4) 196​

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

Choose the correct number in place of '?'

15 : 25 : : 35 : 225 : : 29 : 324 : : 27 : ?

1) 289

2) 169

3) 361

4) 196

EVALUATION

Here it is given that

15 : 25 : : 35 : 225 : : 29 : 324 : : 27 : ?

We first find the pattern

15 : 25 = 15 : ( 1 × 5 )²

35 : 225 = 35 : ( 3 × 5 )²

29 : 324 = 29 : ( 2 × 9 )²

Thus we find the pattern

ab : N = ab : ( a × b )²

Thus we get

27 : ? = 27 : ( 2 × 7 )² = 27 : 14² = 27 : 196

FINAL ANSWER

Hence the number in ? is 196

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