Question 397850
"there are 29 students" ___ g + b = 29


"the number of girls in class is 7 less than two times the number of boys" ___ g = 2b - 7


substituting ___ (2b - 7) + b = 29 ___ 3b - 7 = 29 ___ 3b = 36 ___ b = 12


substituting ___ g + (12) = 29 ___ g = 17