for the first coupon, set the Coupon amount to 5. Set the Minimum Purchase to 25, and the Maximum Value to 5.
for the second coupon, set the Amount to to 10, Set the Minimum Purchase to 60, and the Maximum Value to 10.
for the third one,set the Amount to to 20, Set the Minimum Purchase to 100, and the Maximum Value to 20.
make sure not to select a percentage and to give valid start and end dates.