Question 622633
Hi, there--
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Let x be the first number.
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Then the next three even numbers are x+2, x+4, and x+6.
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The sum of these numbers is 68, so
{{{x+(x+2)+(x+4)+(x+6)=68}}}
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Simplify and solve for x.
{{{4x+12=68}}}
{{{4x=68-12}}}
{{{4x=56}}}
{{{x=56/4}}}
{{{x=14}}}
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In the context of this problem, the equation x=14 means that the first number is 14. The next three even numbers are 16, 18, and 20.
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Checking we see that 14+16+18+20=68. 
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Feel free to email if you still have questions about this.
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Ms.Figgy
math.in.the.vortex@gmail.com