The keyboard of type A computer has 104 keys, which is 72 fewer than twice the number of keys of type B piano. How many keys does the keyboard of type B piano have?
A型电脑的键盘有104个键，比B型钢琴的键的个数的2倍少72个，则B型钢琴的键盘有多少个键．
<gadget id="calculator">104 + 72</gadget>
<output>176</output>

<gadget id="calculator">176 / 2</gadget>
<output>88</output>

<result>88</result>