Question

Tina had $47.10 in her bank account on Monday. She withdrew $25 on Monday and also made a deposit of an amount d that she cannot remember. Tina had $97.43 in her account on Tuesday. Which equation can be used to solve for d, the amount she deposited on Monday?
a. 47.10 – 25+d = 97.43
b. 47.10 – 25 – d = 97.43
c. 47.10+25 – d = 97.43
d. 47.10+25+d = 97.43

Answer 1

The correct answer is a.  47.10 - 25 + d = 97.43.

This is because you have to subtract the $25, because it is a withdrawal, or taking out of money.
This rules out options C and D.  

Also, Tina made a deposit of an amount that she can't remember.  A deposit is adding a certain amount of money, so you have to +d.  

This rules out option B.

The only option left is option A, which makes complete sense.