5. A metric ton of TNT is used as a unit of energy. It is approximately equal to the amount of energy released when a metric ton of TNT is detonated. If a magnitude 13 earthquake on the Richter scale would be equivalent to about metric tons of TNT detonating, about how many joules of energy would the earthquake release?
(Hint: 1 metric ton of TNT =4.2x10^9 joules )

Question

5.	A metric ton of TNT is used as a unit of energy. It is approximately equal to the amount of energy released when a metric ton of TNT is detonated. If a magnitude 13 earthquake on the Richter scale would be equivalent to about   metric tons of TNT detonating, about how many joules of energy would the earthquake release? 
(Hint: 1 metric ton of TNT =4.2x10^9 joules  )

across · Answer

"[...] If a magnitude 13 earthquake on the Richter scale would be equivalent to about metric tons of TNT detonating, [...]"

This conditional statement makes no sense.