Question

you ask a friend to think of a, dounle it and add 10. his answer is 42.if x is the number he thinks if, write the equation​

Answer 1

Your friend thinks of a number --> x

Doubles it --> 2x

Adds 10 --> 2x+10

The final result is 42, so we have

`2x+10=42 \iff 2x=32 \iff x=16`