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# Find number abc

If 7a421 - 57acc = 1b7bb find number abc. Multiple solutions may exist.
The first user who solved this task is Donya Sayah30.
#brainteasers #math

### What Time Is It?

A man had been driving all night and by morning was still far from his destination. He decided park somewhere quiet so he could get an hour or two of sleep.

As luck would have it, the quiet place he chose happened to be on one of the city's major jogging routes. No sooner had he settled back to snooze when there came a knocking on his window. He looked out and saw a jogger running in place.

"Yes?"

"Excuse me, sir," the jogger said, "do you have the time?"

The man looked at the car clock and answered, "8:15."

The jogger said thanks and left. The man settled back again, and was just dozing off when there was another knock on the window and another

jogger.

"Excuse me, sir, do you have the time?"

"8:25!"

The jogger said thanks and left. With other joggers passing by it was only a matter of time before another one disturbed him.

To avoid the problem, he got out a pen and paper and put a sign in his window saying, "I do not know the time!"

Once again he settled back to sleep. He was just dozing off when there was another knock on the window.

"Sir, sir? It's 8:45!"

Found on https://forums.runnersworld.co.uk, posted on July 2003 by Wolfy forum member.

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### Industrial pollution

In 1876, a Royal Commission on Noxious Vapours was appointed by the British government to inquire into the management of chemical works, to determine the effects of certain gases and vapours emitted, and investigate means of prevention. The Commission inspected alkali works, cement works, chemical manure works, copper, glass, lead, salt and metal works, coke ovens and potteries. In their report, issued in Aug 1878, they recommended increasing the number of visits by inspectors, recording any escapes of gases, the publication of inspectors' reports, and more stringent regulations, despite witnesses arguing that noxious vapours were the inevitable and unalterable cost of national prosperity.[* p.251]
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