there is a 40 cm line marked at each centimeter and an insect is placed at every centimeter . 9 frogs are trained to jump a constant distance . the first one jumps 2 cm in every leap , the second one jumps 3 cm and so on until the 9 th one jumps 10 cm in every leap and they eat any insect that is available at that spot . if all of them start from start line and finish the entire 40 cm , how many insects were still left after the race was over ?
"only the prime numbers greater than 10 and less than 40 were left . that is 11 , 13 , 17 , 19 , 23 , 29 , 31 , and 37 . the total is 8 . the answer is d ."
add(10, 2)