The average score of Dongdong's three math exams is 89, and the average score of the four math exams is 90 points. How many maths did Dongdong get in the fourth math exam?
冬冬三次数学考试的平均分是89分，四次数学考试的平均分是90分，冬冬第四次考试数学得了多少份？
<gadget id="calculator">90 * 4</gadget>
<output>360</output>

<gadget id="calculator">89 * 3</gadget>
<output>267</output>

<gadget id="calculator">360 - 267</gadget>
<output>93</output>

<result>93</result>