Question 8204
Without any parentheses to change the order of evaluation, the rule is to do multiplication and division operations left to right.
So, it's 
a times b divided by 6 multiplied by c, which is
32 x 45 / 6 x 5.
Your second calculation is correct [1200]. 
Note: if the author wanted to do the multiplication first, the expression would have been 
ab/(6c), read "a times b divided by the quantity 6 times c."