kopecks

As others pointed out, in #1, unless the kopecks are integer, the answer is underconstrained.

That means that Masha has no money, and Misha has six kopecks, so they combined 0 + 6 and are still short of 7.

Yes, I mean surely Chamberlain could maintain a correct and official API endpoint for HomeAssistant users for the kopecks it would cost.

People can transfer kopecks to others without Putin's knowledge or say-so, manipulating social networks beyond Putin's direct control.

Somebody willing to risk $1b on Waymo doesn't credibly care about the kopecks they are earning on rides today.

This precariousness is compounded by international trade, making the value of kopecks at least partly dependent on economic performance.

Therefore, Misha doesn't have any money, and the price book is what Misha is missing: 7 kopecks.

If the price was eight kopecks, they'd have one and seven each, and would have exactly enough.

If it cost nine kopecks, they'd have 2 and 8, and would have more than enough.

My answer to #1 is less than 8 kopecks, and Masha has less than one.

Source: every single Russian oligarch, who borrowed eye watering amounts of money just before hyperinflation hit, and returned kopecks on the ruble.

Depends on whether kopecks are divisible into a smaller monetary unit or not.

If they are divisible into 100 units, I believe the answer is "anywhere between 7.00 and 7.99 kopecks".

It's more about "ice cream for 47 kopecks" rathan then anything else.

Masha needs 7 kopecks to buy 1 book "Misha lacked one", which means to me as an native English speaker that Misha needed just one more Kopeck in order to purchase 1 book.

Kopeck - "It is usually the smallest denomination within a currency system." I presume they used kopecks for a purpose and not rubles, dollars or another unit that can be subdivided.