Tinh exchanges business equipment with an adjusted basis of $55,000 (initial basis was $105,000) for business equipment

Question:

Tinh exchanges business equipment with an adjusted basis of $55,000 (initial basis was $105,000) for business equipment worth $42,000 and $20,000 in cash.
a. What is Tinh's realized gain or loss on the old equipment?
b. How much of the realized gain or loss is recognized on the exchange?
c. What is the character of the recognized gain or loss?
d. What is the basis of Tinh's new business equipment?