[support] Creating Computed field from values of other computed fields

Hi I'm trying to create computed fields based on other computed fields but it doesn't display anything.

First I created the following: Male Participants Age 13 Age 14 Age 15

Created a computed field to calculate the male participants (participants_male_total) I then did the same for female participants and created another computer field to hold that total(participants_female_total)

Then I created a new computed field (participants_total) = male_total +female_total But I can't get it to calculate unless I simply add all the male and female files together.

Any suggestions as to what I'm doing wrong?

Thanks in advance.