exam Maths Puzzle Numerical Ability

Find the value of the variable and ST if S is between R and T.

RS=7a,ST=12a,RS=28

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Thanks again!!!!
Solve by addition. If a unique answer does not exist, state whether it is inconsistent or dependant. McGraw Hill. 6th editon. 8.2. #12.
2x+3y=1
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