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Here we are talking about terrorism i.e.a serious problem on a larger scale ,so we need to use a word which matches the intensity of the topic we are talking about, therefore ‘Nefarious’ is the correct word. Other words are not of that high degree.
Amit age after 20 years will be 4 times his age 4 years back. What is the present age of Amit?
A boy’s age is 125% of what it was 8 years ago, but 75% of what it will be after 8 years. What is his present age?
The sum of the ages of A and B is (3x + 10) years. 5 years ago, the ratio of their ages was 4:5. Find the present age of A, if B is 4 years older than A.