Charles rode his bike 19 miles each week while training. here is his record of the number of miles he rode monday 2.2mi tuesday? wensday 3.8 mi thursday ? friday 5.4 mi charles rode 1.6 miles more on thursday than tuesday . find the number of miles he rode on tuesday and thursday

Let x =  miles that Charles rode on Tuesday, and let
       y = miles he rode on Thursday.

The given data is therefore
Mon  Tue  Wed  Thu  Fri
2.2    x       3.8     y      5.4

Because Charles rode 1.6 more miles on Thursday than Tuesday, therefore
y = x + 1.6          (1)

The total miles for the week is 19 miles, therefore
2.2 + x + 3.8 + y + 5.4 = 19
x + y + 11.4 = 19
x + y = 7.6           (2)

Substitute equation (1) into equation (2).
x + (x + 1.6) = 7.6
2x + 1.6 = 7.6
2x = 6
x = 3

From (1), obtain
y = x + 1.6 = 3 + 1.6 = 4.6

3 miles on Tuesday
4.6 miles on Thursday