Answer: 7
Well the best way to answer this is to eliminate incorrect options as it’s hard otherwise and since we have options we might as well use it…
Step by step:
Step 1:So let’s start with 3…it says 6 less than 3 times the length so 3 x 3 which is 9 - 6 which is 3…we know that area is length times width so 3 x 3 which is 9 but we need 105 so that’s wrong…
Step2: now let’s check 7 so 7 x 3 which is 21 then -6 which is 15.Now you can multiply this on a paper or in your head..if your doing this in your head than we can make this easier buy splitting 15 and we can re-write this as…(7x10) + (7x5)..so 7 x 10 is 70..and 7 x 5 is 35..70 + 35 is 105…so we know that 7 is the answer..