SOLUTION:
Let the cost of a peach = x
The cost of a mango = x + 4
[tex]10x\text{ + 8(x+4) = 95}[/tex][tex]\begin{gathered} 10x\text{ + 8x + 32 = 95} \\ 18x\text{ = 95 - 32} \\ 18x\text{ = 63} \\ x\text{ = }\frac{63}{18}=\text{ 3.5} \end{gathered}[/tex][tex]\begin{gathered} \text{Peach = \$3.5} \\ \text{Mango = 3.5 + 4 = \$7.5} \end{gathered}[/tex]The cost of three pounds of mangos;
[tex]\begin{gathered} 3\text{ (\$7.5)} \\ \text{\$22.5} \end{gathered}[/tex]