The mother divides the money between the elder brother and the younger brother at a ratio of 4:3 for lunch, and distributes 20 yuan to the elder brother.
妈妈将钱按4：3分给哥哥和弟弟作为午餐费，分给哥哥20元，那么，分给弟弟多少元．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>