How many ads should we have in each group to optimize our ROI?

[HeavenlyBorn]

How many ads should we have in each group to optimize our ROI?

[WoodsPainting]

Google recommends having at least 2-3 ads per ad group (if your question is about search network campaign). The recommended number of ads should be also based on a number of impressions your ad group will receive.

[Paro]

Specifically, limit the number of keywords used in each of your ad groups for simpler management of campaigns. According to Google, 5 to 20 keywords should suffice, but there are marketers who use a single keyword per Ad group (SKAG)