If a and b are positive integers and a-b/3.5 = 4/7 , then

1. b < a
2. b > a
3. b = a
4. b > a

Answer: b < a Explanation: ( a – b)/3.5 = 4/7
a – b = (4×35)/ ( 7×10) = 2
a>b [ a&b positive ]
or, b