4d+6= 42
⇒ 4d= 42-6
⇒ 4d = 36
⇒ d= 36/4
⇒ d= 9
The final answer is d=9~
<span>2(3/2 + 5/3) - 1/3
3 + 10/3 - 1/3
3 + 9/3
3+3
6</span>
No, the quotient of an integer divided by a non-zero integer is not always a rational number.
The fraction of completed deliveries is

We want to express 0.45 as a fraction with denominator 100:

So, 45% of the work has been done so far.