Astudent solved this problem by making a table.

arturo has $120. max has $90. in how many years will they both have the same amount of money if arturo saves $90 per year and max saves $100?

arturo $120 $210 $300 $390
max $90 $190 $290 $390
year 0 1 2 3

here is a problem that can also be solved by making a table.

amira has $80. sasha has $40.

in how many months will they both have the same amount of money if amira saves $40 per month and sasha saves $50?

months