The phrase "are able to deduce" is correct and usable in written English.
You can use it when discussing someone's capability to draw conclusions or infer information based on evidence or reasoning.
Example: "With the clues provided, the detective are able to deduce the identity of the culprit."
Alternatives: "can infer" or "are capable of concluding".
Smart means that all pirates are able to deduce the logical consequences of any proposal.
By analyzing the pattern of neutrons bouncing off the material, scientists are able to deduce the positions of atoms in the material.
The best players are able to deduce the presence of particular cards in opponents' hands long before those cards have been exposed in play, based on what's happened so far, and they think like oddsmakers.
"Those who wish to hold forth to the public by this means often take steps to disguise their authorship, but it is in my judgment a significantly further step to argue, if others are able to deduce their identity, that they should be restrained by law from revealing it," said Eady.
Astronomers are able to deduce the objects' sizes by timing these stellar occultations precisely from various spots on Earth.
From the sequences of the genes, we are able to deduce a biosynthetic pathway for the emericellamides.
He was able to deduce that the music was from King Stephen, incidental music for a theatre piece.
Watching the convention, all you might be able to deduce is that whatever he plans, it's going to be accomplished to the music of Motown.
By modeling the seismic waveforms, the researchers were able to deduce the style of faulting responsible for the earthquakes.
Once dates for this are known you'll be able to deduce the best time to try to get an Olympic exiles holiday.
From the records, the CIA was able to deduce how many agents the Cubans were running, their rough geographical locations and the command structure of the DI.
