3 grade math
posted by dw .
Jan, Mya, and Sara ran a total of 64 miles last week. Jan and Mya ran the same number of miles. Sara ran 8 less miles than Mya. How many miles did Sara run?
64 miles in all
Jan  Mya  Sara
Same as Mya  Same as Jam  8 less
my son need help in this question

I don't know how your son is supposed to do this.
Here's a simple algebra solution. Let x = the miles that Jan and Myra each ran.
x + x + x  8 = 64
3x  8 = 64
3x = 64 + 8
3x = 72
x = 72/3
x = 24
24  8 = 16 
do you have a different way to explain to me then i can explain to my son thank you

i need help

this makes no sense to me and won't to my child either. the instructions for solving, are try 3 numbers that add to the total with 2 numbers equal and the other 8 less then revise numbers till you get the answer.

64÷2=328=248=16

64÷2=328=248=16