OK guys so a noob question and kinda mathematical

, when you buy an altcoin through bitcoin (same goes for etherium) in an exchange and the price of the altcoin at that given time is high and that of bitcoin is lets assume 5000USD and after few months the price of the BTC goes to 7000USD and the price of the altcoin drops to half. does this means that if you would like to convert back to BTC and then sell it for USD you are loosing more whereas if the price of the BTC was still the same but the price of the altcoin drops more than half? iam confused any help?

If you buy altcoin X for 0,5 btc (1500 USD)

x = 0,5 BTC

Bitcoin price now 3K USD

After a while

X= 0,25 BTC (realized losses of 50%)

Bitcon price is up to 6K USD

in Fiat now your investment is worth 0,25 x 6000 = 1.500 USD, so in fiat you didn't lose anything.

But potential loss is 1500 USD if you didn't buy the altcoin and just held your investment in bitcoin.

TLDR: gains and losses can be calculated in bitcoin value and fiat value, choose which one you find more meaningfull.