There are 32 red flowers and 7 yellow flowers. To make the number of red flowers four times that of yellow flowers, if the number of red flowers remains the same, how many yellow flowers are needed.
红花有32朵，黄花7朵，要使红花的朵数是黄花的4倍，如果红花朵数不变，需要拿来多少朵黄花．
<gadget id="calculator">32 / 4</gadget>
<output>8</output>

<gadget id="calculator">8 - 7</gadget>
<output>1</output>

<result>1</result>