[tex]a \div b = 7 = > a = 7b[/tex]
[tex]a - b = 60[/tex]
[tex]7b - b = 60[/tex]
[tex]6b = 60[/tex]
[tex]b = \frac{60}{6} [/tex]
[tex]b = 10[/tex]
[tex]a = 7b[/tex]
[tex]a = 7 \times 10[/tex]
[tex]a = 70[/tex]
[tex]c \div a = 5[/tex]
[tex]c \div 70 = 5[/tex]
[tex]c = 5 \times 70[/tex]
[tex]c = 350[/tex]
