Let's make an equation. T will be the number.
(T+5)/4=7
Let's multiply both sides by 4 to get T by itself.
T+5=28
Subtract 5 from both sides.
T=23
Your number is 23.
312* 17.5= 5460.00
134*19=2546
2546+5460= $8,006.00
0.8 or 4/5
Both are correct, but in different form.
Your welcome.