Albert is 2 times Mary’s age and 4 times as old as Betty. Mary is 10 years younger than Albert. How old is Betty?  Choose the correct choice:  A) 5  B) 8  C) 10  D) 12  E) 15
5 = 2M = M+10= 
<gadget id="calculator">+10</gadget>
<output>10</output>
10   5= 20   5 = 4B, and so B = 5   The answer is 5.
<result>A</result>
Albert is 2 times Mary’s age and 4 times as old as Betty. Mary is 10 years younger than Albert. How old is Betty?