In the story about the food shortage at the Shraddha ceremony, how did placing Baba's picture on the wall and offering it a garland help multiply the food?

The provided text from Chapter 35 describes two separate instances of faith and miracles, and the question incorrectly combines them. The practice of placing Baba's picture on the wall and offering it a garland was done by a gentleman to overcome his bad dreams and sleep disturbances. The miracle of the food being multiplied occurred separately, at Balaji Nevasakar's anniversary ceremony (Shraddha). In that story, Balaji's mother-in-law averted the food shortage by putting a handful of Udi into the cooking pots while having firm faith in Sai. The source does not mention a picture or garlands being used in the food multiplication miracle.