Booshin d.A.

At the beginning of the year, nuts, bolts, and washers were sold at the same price of 1 ruble per 1 kg. On February 27, the Supreme Soviet of the USSR passed a law to increase the price of nuts by 50% and decrease the price of bolts by 50%. On February 28, the Supreme Soviet of the RSFSR passed a law to decrease the price of nuts by 50% and increase the price of bolts by 50%. Which item will be the most expensive and which the cheapest in March?

## Answer

The price of washers will not change, making them the most expensive, while nuts and bolts will cost 75 kopecks each.

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On the New Vasyuki currency exchange, 11 tugriks are exchanged for 14 dinars, 22 rupees for 21 dinars, 10 rupees for 3 thalers, and 5 crowns for 2 thalers. How many tugriks can be exchanged for 13 crowns?

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For 5 crowns, they give 2 thalers, which means for one crown, they give $2 / 5$ thalers. Similarly, for one thaler, they give $10 / 3$ rupees, for one rupee $-21 / 22$ dinars, and for one dinar ${ }^{11} / 14$ tugriks. Therefore, for one crown, they give $2 / 5 \cdot{ }^{10} / 3 \cdot 21 / 22 \cdot{ }^{11} / 14=1$ tugrik, and for 13 crowns, accordingly, 13 tugriks.

## Answer

13.