Represent 'a number' by x
7 times x equals 9 more than 4 times x
7 times x=9+4 times x
7x=9+4x
subtract 4x from both sides
3x=9
divide 3
x=3
the number is 3
I would just divide 400 and 10 and then try to come up with the salary
Answer:
scale is 4...... ........