In the formula, ☆ and △ each represent a number. It is known that (☆-△)*0.5=12, △/0.1=50, ☆=how much.
算式中☆和△各代表一个数，已知(☆-△)*0.5=12，△/0.1=50，☆=多少．
<gadget id="calculator">12 / 0.5</gadget>
<output>24</output>

<gadget id="calculator">50 * 0.1</gadget>
<output>5</output>

<gadget id="calculator">24 + 5</gadget>
<output>29</output>

<result>29</result>