Quantitative Aptitude Ques 2152
Question: Directions: What approximate value will come in place of question mark (?) in the given questions? (You are not expected to calculate exact value.) [IBPS (SO) IT 2015]
$ ({{41.99}^{2}}-{{18.04}^{2}})-?={{13.11}^{2}}-138.99 $
Options:
A) 4004
B) 1200
C) 1720
D) 8432
E) 1410
Show Answer
Answer:
Correct Answer: E
Solution:
- $ ({{41.99}^{2}}-{{18.04}^{2}})-?={{13.11}^{2}}-138.99 $
$ \Rightarrow $ $ (42^{2}-18^{2})-?={{(13)}^{2}}-139 $
$ \Rightarrow $ $ {(42+18)(42-18)}-?=169-139 $
$ \Rightarrow $ $ (60\times 24)-?=30 $
$ \Rightarrow $ $ 1440-?=30 $
$ \Rightarrow $ $ ?=1410 $
BETA
