Question

Esth had five times as many cards as Rich. Esth gave 1/4 of her cards to Rich. Rich. gave 1/6 of his cards to Esth in return. In the end, Esth had 90 cards more than Rich. How many cards did Esth have at first?
Steve
is the swap simultaneous, or did Rich give her his 1/6 after he received her 1/4?
Anonymous
Rich gave her his 1/6 after he received her 1/4. Please help