Meerah

The solution is too simple. Lets try to solve if the answer is 7 or 9. 9 tricycle x 3 (tricycle wheel) = 27 wheels 27 tricycle wheels - 43 wheels ( given in the question) = 16 wheels remaining 16 wheels / 2 (bicycle) = 8 bicycle Which means, there's a pos...

Both of them is correct. But we have to choose the BEST ANSWER. 😅

40/360= 1/9 1/9*72 =8cm squared

using linear expansivity formula a= change in length/ initial length * change in temperature making initial length subject of the formula L1 = l2/ 1+ adt L1= 70.5/1+1.8*10^-5* (50-20) L1 = 70.46