Question 34
Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
232 : 21 :: 343 : 30 :: 157 : ?
Solution
The digit sum of the first number in each set is multiplied by 3 to obtain the second one.
232 : 21
232 ==> $$(2+3+2)\times3$$ = $$7\times3$$ = 21
343 : 30
343 ==> $$(3+4+3)\times3$$ = $$10\times3$$ = 30
157 : ?
157 ==> $$(1+5+7)\times3$$ = $$13\times3$$ = 39
Here '39' will come in place of the question mark.
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