Question

What is the difference between the total number of males and females in the building?

Q: Answer-&lt;p&gt;What is the difference between the total number of males and females in the building?&lt;/p...

Let the number of people who read lsquoThe Hindu and TOI Onlyrsquo be x Let the number of people who read lsquoThe Hindu and Economic Times Onlyrsquo be y. Let the number of people who read lsquoTOI and Economics Times Onlyrsquo be z. Given that 40 20 x y 100 gtxy 40 ---- i 70 20 xz 150 gtxz 60 ----ii 100 20 yz 200 gtyz 80 -----iii Adding eq. i, ii and iii, we get 2 xyz 180 xyx 90 ----iv Now, subtracting iv by i, we get z 50 Now, subtracting iv by ii, we get y 30 Now, by subtracting iv by iii, we get X10 Total number of males 58 of 40 710 of 70 1120 of 100 45 of 10 715 of 30 25 of 50 34 of 20 Total number of females 320 - 186 134 Required difference 186 ndash 134 52