Question

$0.10d+0.25(d+7)=5.25$

Short answer

The value of$d=10$

Step-by-step solution

- The given information

$0.10d+0.25(d+7)=5.25$

Step 2

$$\begin{gathered} 0.10d+0.25(d+7)=5.25 \\ \Rightarrow 0.10d+0.25d+1.75=5.25 \\ \Rightarrow 0.35d=5.25-1.75 \\ \Rightarrow 0.35d=3.50 \\ \Rightarrow d=10 \end{gathered}$$