NEW YORK (TheStreet) -- Jim Cramer answered viewers' Twitter (TWTR) questions from the floor of the New York Stock Exchange.

When one viewer asked him what's going on with Intel (INTC) after its $16.7 billion deal for Altera (ALTR), Cramer acknowledged that there are people who believe that Intel paid too much for the company. However, Cramer explained why he believed not only is it a good tie-up between the two companies, but Intel is doing what it needed to by being aggressive. He stressed that Intel chief executive Brian Krzanich is doing the right thing.

In biotech, Cramer advised another viewer not to sell Amgen (AMGN). While it's not one of his "four horsemen" and he believes Gilead (GILD), Biogen Idec (BIIB), Celgene (CELG) and Regeneron (REGN) are all doing better, Cramer explained that Amgen has some incredible anti-cancer formulations that he's very keen on. He believes investors should stay with the stock.

As for Costco (COST), after May same-store sales came in flat, Cramer revealed that he believes the stock is a buy here. He explained that a lot of numbers would be looking a lot better if the U.S. dollar were weaker. In fact, Cramer said that's the key to this market -- the U.S. dollar has to to get weaker.

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