Question

If iost 6 balls and i buy of box of 12 and lost 4 and now i have 18 how many there are begin with

Answer 1

Let's say you have $b$ balls at the beginning. Your steps are:

• You lose 6 balls: $b-6$
• You buy 12 balls: $b-6+12 = b+6$
• You lose 4 balls: $b+6-4 = b+2$

So, since you have 18 balls now, you have

$b+2 = 18 \iff b=16$

So, you had 16 balls to begin with.