1/4 of the total number of bottles in the truck carries (56-18= 38) so 38 bottles in 1/4 of the total number of bottles, and if 1/4 of it is 38 bottles, I'm guessing you would have to do 38*4 to get your answer (152 bottles).
I dont know how to solve it but since the answer shows as 6 and -7, if you plug it in as x values, one tiem as 6 and second time as -7 it doesnt equal 42
