ran 195 min on the weekend ran 25 min more
on Sat, what min of Sat and Sun
you can only use addition and subtraction.
You have two time periods, x min and (x + 25) min
together they add up to 195 min
x + (x + 25) = 195
x + x = 195 - 25 = 170
It's impossible to solve this without using
multiplication and division
2x = 170
x = 85 min for Sunday
x + 25 = 110 min for Saturday