Question 1053800
C = A+7 We'll use this value for C next
and
C+15 = 2(A+15)-33 Substitute for C on the left:
A+7+15 = 2A+30-33
A+22 = 2A-3  Subtract A on both sides and add 3 on both sides:
A-A+22+3 = 2A-A-3+3 Simplify:
25 = A
or, more elegantly:
A = 25 Anne is 25 and so Carl is 25+7 = 32
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In 15 years:
Carl: 32+15 = 47
Anne:25+15 = 40
At that time, 15 years from now, Carl will be 2A-33. Let's see:
47 = 2(40)-33
47 = 80-33 Correct
:
John