if u use 5/6 of ur wages for spending money, then u are saving 1/6 of ur wages.
y = 1/6x....where x is ur weekly wages and y is amount saved for the week.
y = 1/6x.....when x = 60
y = 1/6(60)
y = 60/6
y = 10
y = 1/6x...when x = 120
y = 1/6(120)
y = 120/6
y = 20
y = 1/6x..when x = 180
y = 1/6(180)
y = 180/6
y = 30
y = 1/6x...when x = 300
y = 1/6(300)
y = 300/6
y = 50