Sorry, couldn't see the discussion for Q7 in M01 and neither could add the discussion anywhere else.
Although I answered this question correctly, I need a help in solving this problem in the quicker way
Question Number 7
A ship is transporting several cats and a crew (sailors, a cook, and a one-legged captain) to a nearby port. If these passengers combined have 15 heads and 41 legs, then how many cats is the ship transporting?
My explanation for this question is:
Let's denote A- cats, B- Sailors ( Don't fall into trick , as Sailors is in plural), C- cook =1, and D- captain-=1 ( and one legged)
thus we have : a+b+1+1= a+b+2 people on the board
We know that there are 15 Heads in total THUS,
We also know that there are 41 legs in total,
Bear in mind that cats ( A) have 4 legs, and captain has 1 leg , equations is as follows:
Substitute from 1st equation:
IF you have any shorter solutions please share !
Thanks in advance