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Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?

Correct answers: 27

The first user who solved this task is Slobodan Strelac.

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A Birthday Wish

Little Sonia was shouting her prayers. "Please God send me a new doll for my birthday.
"Her mother, overhearing this, said, "Don't shout dear, God isn't deaf."
"No, but Grandad is, and he's in the next room," Sonia replied.

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Stereo FM

In 1961, regular FM stereo radio broadcasting with a multiplexed signal began in the U.S. In Schenectady, NY, WGFM (owned by G.E.) was first on the air, at 12:01 a.m. Eastern time. Zenith's WEFM in Chicago, IL, followed and KMLA in Los Angeles, CA, where midnight local time arrived relatively one or three hours later due to time zone differences. Each scheduled a few hours of stereo broadcasts. Federal Communications Commission (FCC) approval specified the starting day. Experiments with stereo radio began with AM in the 1920s. Field tests for stereo FM began in Mar 1959 to evaluate various competing systems. On 19 Apr 1961, the FCC adopted a stereo FM broadcasting standard, a hybrid of similar methods invented by G.E. andCarl G. Eilers of Zenith, compatible with existing AM radio receivers.«

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