If function

Hello,

Require help to create a formula as follows:

If A5 < A6; then i will use two values A6+c5 and B5-A6, If A5 > A6 & <A7; then I will use two values A7+C5 and B5-A7, If A5 > A7 & < A8; then I will use two values A8+C5 and B5-A8

thanks!