Solution of the problem 481 of the collection on genera
If the total amount of your purchases from the seller Михаил_Перович more than:
- 20469 ₽ the discount is 15%
- 10234 ₽ the discount is 10%
- 5117 ₽ the discount is 7%
- 2047 ₽ the discount is 5%
- 1023 ₽ the discount is 3%
- 512 ₽ the discount is 2%
- 102 ₽ the discount is 1%
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481. In what relation should the masses of water and ethyl alcohol be found, so that when mixed, a solution crystallizing at -20 ° C should be obtained?