book Maths Puzzle Numerical Ability

Five times a number subtracted from 3 times the number equals 20. Find the number.

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book Other Question

A Right Triangle Problem.
Trying to calculate the height of a tree by its shadow cast on May 11.
Being a right triangle - one angle will be
90 degrees

( the 2nd angle will
For each expression, either perform the indicated operation or solve the equation, whichever is appropriate.

1. -2/x=3/x+2