Final answer:
To find out how much money Adil put in his account initially, we need to solve the equation 685 = (5/3)x, where x is the original amount he put in.
Step-by-step explanation:
To find the amount of money Adil initially put into his account, we need to solve the equation:
685 = (5/3)x
where x is the original amount (in dollars) Adil put into his account. To isolate x, we can multiply both sides of the equation by its reciprocal (3/5):
x = (685 * 3)/5
Calculating this expression, we find that Adil initially put $411 into his account when he opened it.