book Maths Puzzle Numerical Ability

x= 2y-1 and 2x+y=81

solve using substitution

x=?
y=?

show work please thank you!!

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book Other Question

For example in a triangle a b c which do you think will or should be the base? A bus traveled on a level road for three hours at an average speed 20 miles per hour faster than it traveled on a winding road. The time spent on the winding road was 4 hours. Find