Alexander was 50 inches on his 8th birthday. If he grows 1/2 a foot a year, how many inches tall will he be on his 12th birthday?
He grows six inches a year because 12 x .5 = 
<gadget id="calculator">12*.5</gadget>
<output>6</output>
6.
He will grow 24 inches between his 8th and 12th birthday because 4 x 6 = 
<gadget id="calculator">4*6</gadget>
<output>24</output>
24.
He will be 74 inches tall because 50 + 24 = 
<gadget id="calculator">50+24</gadget>
<output>74</output>
74.

<result>74</result>