| a). 21. _____________ |
b). 40. _____________ |
| c). 60. _____________ |
d). 720. _____________ |
| a). 18 and 27 ______________ |
b). 24 and 42 ______________ |
| c). 44 and 66 ______________ |
d). 36 and 81 ______________ |
| e). 42 and 48 ______________ | |