Question

The difference between two numbers is 7 six times smaller no plus larger no is77 find nos

Answer 1

x - z= 7 
and 6z +x= 77
x= z + 7
6z + z+7 = 77
7z = 70
z = 10(smaller number)
x = z+7 = 17(larger number)

Answer 2

x-y = 7...............(1)
6x+y = 77............(2)
(2)+(1)
7x=70
x=10
y=17