if a ( a + 7 ) = 60 and b ( b + 7 ) = 60 , where a ≠ b , then a + b =
"i . e . if a = 5 then b = - 12 or if a = - 12 then b = 5 but in each case a + b = - 12 + 5 = - 7 answer : option a"
add(divide(60, const_10), divide(60, divide(60, const_10)))