A bunch of fruits are put into baskets, if each basket holds 50 kg, there will be one more basket. If each basket contains 40 kilograms, there is still one basket short. How many kilograms does this pile of fruit weigh? (Equation solution, assuming there are x baskets)
一堆水果装筐，如果每筐装50千克，则多出一个筐．如果每筐装40千克，则还差一个筐．这堆水果有多少千克？(方程解，设筐有x个)
<gadget id="calculator">50 * 8</gadget>
<output>400</output>

<result>400</result>