Question 447478
In 5 years Sandy will be 4 years younger than twice Tim's age.  Set up the equation.
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Let S = Sandy's age
and T = Tim's Age
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Break up:
"In 5 years Sandy will be 4 years younger than twice Tim's age."
to get your equation
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In 5 years, they BOTH will have aged 5 years:
"In 5 years" Sandy's age is S+5
"In 5 years" Tim's age is T+5
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Therefore:
"In 5 years Sandy will be 4 years younger than twice Tim's age."
S+5 = 2(T+5)-4
Your equation says twice Tim's current age plus 5.