What is meaning of solve?

transitive verb. 1 : to find a solution, explanation, or answer for solve a problem solved the crime. 2 : to pay in full solve a debt.

Is the T silent in exactly?

In practice, yes it is virtually silent unless one makes a special effort to pronounce it. When we have a consonant cluster here /ktl/ one sound is often not heard. The linguistice term for it is “dissimilation”.

How is 70 pronounced?