Explanation:
Because of the 4:1 ratio, the cumulative number of pieces taken into account in that ratio is 4 + 1 = 5.
There is a total amount of money of $150 and 5 pieces.
150/5 = $30 is a single component number.
We know that Ivan consists of four pieces, while Tanya consists of one piece of $120 and 30.
As a result, we now split the amount of Ivan into the amount of Tanya: Ivan has 4 times more than Tanya, so Ivan has 4 times more money.
Hope that works!