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Find number abc

If ab2c4 - cba46 = 5a2bb find number abc. Multiple solutions may exist.

Correct answers: 3

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Old friends

Mary and Jane are old friends. They have both been married to their husbands for a long time; Mary is upset because she thinks her husband doesn't find her attractive anymore.

"As I get older he doesn't bother to look at me!" Mary cries.

"I'm so sorry for you, as I get older my husband says I get more beautiful every day." replies Jane.

"Yes, but your husband's an antique dealer!"

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Optical pulsar announced

In 1969, the New York Times made public the news of the discovery a few days earlier of the first optical pulsar by astronomers at the University of Arizona on 16 Jan 1969. It was the result of a year's search using a stroboscopic technique. Flashes of light in the optical range were found coming from the same location in the Crab Nebula as a previously known pulsar emitting radio bursts. The rate of pulsation of the two signals was found to be the same, and thus presumed to be from a single star. Other observatories were immediately notified and the flashing was confirmed by the McDonald Observatory and by the powerful 84-inch reflector telescope at the Kitt Peak National Observatory in Arizona. The star was flashing at a rate of about 30 times per second, with intermediate flashes of lesser intensity.

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