chair is 15 yuan, and the price of a table is 6 times that of a chair. How much does it cost to buy such a set of tables and chairs?
一把椅子15元，一张桌子的价钱是一把椅子的6倍，买这样一套桌椅需要多少元？
<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<gadget id="calculator">90 + 15</gadget>
<output>105</output>

<result>105</result>