# Jacob wanted to buy 4 servings of ice cream, but he lacked 30 rubles. Then he bought 3 servings of ice cream, and he had 20 rubles left. How much is a serving of ice cream?

Jacob wanted to buy 4 servings of ice cream, but he lacked 30 rubles. Then he bought 3 servings of ice cream, and he had 20 rubles left. How much is a serving of ice cream?
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Let 1 serving of ice cream cost x dollars, then 4x is the cost of four servings, and Jacob has 30 dollars less, so 4x-30 is the amount of money that Jacob has, at the same time 3x is the cost of three servings of ice cream, and Jacob is $20 more, then 3x + 20 is also the amount of money Jacob has. Let's make an equation: 4x-30=3x+20 4x-3x=20+30 x=50 1 serving of ice cream costs$50