Question 1180400
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Hi
Let c and d represent their respective ages NOW:
 c- 8 = 2(d-8) + 1
 c + 8 = (7/6)(d+8)

c  -   2d = -7
<u>c - (7/6)d = 56/6 - 48/6</u>

- c  +   2d = 42/6
<u>  c - (7/6)d = 8/6</u>
       (5/6)d = 50/6
            d = 10, David's age NOW

c = 13 NOW {{{ c = (7/6)(10+8) - 8}}}
  5 = 2(2) + 1   checks   {{{c- 8 = 2(d-8) + 1}}}
Wish You the Best in your Studies.
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