@astrodustX backing up car 3 would free up cars 1 & 2 to proceed
Freeing up cars 1 & 2 would free up cars 4 & 5 to proceed
Freeing up cars 4 & 5 would free up cars 6 & 7 to proceed
Then, car 3 can proceed
Answer: car 3
80
The pattern is that right side of each equation is unequal by a factor of 2 times one of the left side's multipliers. One solution is to add two to the second multiplier of the left side of each equation. When applied to the fourth equation with the missing right side, the right side would calculate to the value of 80
5 x 7 = 35
6 x 8 = 48
7 x 9 = 63
8 x 10 = 80
@_alee__sha_ 60
multiplication/division operations takes precedence over addition/subtraction operations. This can be sorted out parenthetically
x = (30➗5) + (5 x 2)
x = (6) + (10)
x = 60
@Jannatun111111 20
Mathematical expressions get evaluated by invoking operators, first according to operator precedence ( multiplication/division before addition/subtraction) and then from left to right.
Organizing parenthetically:
x = 40 - ((8➗2) x 5)
x = 40 - (4 x 5)
x = 40 - 20
x = 20