Question

william gave 4 football cards to each of his 6 friends. suppose he had 54 cards left. write and solve an equation to find how many cards each friend initially had.

Answer 1

For this case, the first thing we must do is define a variable.
 We have then:
 x: number of initial cards.
 We write now the equation that represents the problem:
 x - (4) * (6) = 54
 From here, we clear the value of x:
 x = (4) * (6) + 54
 Rewriting:
 x = 24 + 54
 x = 78
 Answer:
 The number of cards that william has initially is 78. Lack of information to know how many cards his friends have.