exam Maths Puzzle Numerical Ability

1/3(s-2)=s+4

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Help again please. Here goes.
A revenue of $1800 is obtained from the sales of item A at $30 each and item B at $90 each. What is the equation that shows the relationship betwe A family made a trip by car. She travels 1312 km in 3 days. On the 2nd day, it is 2 times the number of km from Day 1. On the 3rd day, it is 98 km less than the 2nd day. Find the d