The sum of the lengths of a fish tank is 280 cm. Among them, the circumference of the bottom is 50 cm, the circumference of the right side is 40 cm, and the circumference of the front is 50 cm. How many square centimeters does this fish tank occupy?
一只鱼缸，棱长和为280cm，其中，底面周长为50cm，右面周长为40cm，前面周长为50cm，这只鱼缸的占地面积是多少平方厘米？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>