72
68.
9 and 36
The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.
I think you are looking for 36
80
79 + 73 = 152
80 because 16*5 = 80
77.
21 can go into 80 a maximum of 3 times. This is because 21 multiplied by 3 equals 63, which is the largest multiple of 21 that is less than 80. When 21 is divided into 80, the quotient is 3 with a remainder of 17.
80 cm is less.
80% less than 90 = 20% of 90 = 18
-56