Basic Math MCQ 17 (Collective and individual earning calculation)
MCQ 17: A, B and C together earn Rs.150 per day while A and C together earn Rs.94 and B and C together earn Rs.76. The daily earning of C is.
a) 10 Rs, b) 15 Rs, c) 20 Rs. d) 25 Rs.
By given condition information we can arrange information;
\[ A+B+C=150—————-(1 \]
\[ A+C=84—————-(2 \]
\[ B+C=76——————–(3 \]
Adding eq 2 and 3
\[ A+B+2C=94+76=170 \]
From there we get value of A+B
\[ A+B=170-2C \]
Put this value of A+B in eq 1
\[ (170-2C)+C=150 \]
\[ C=170-150=20 \]
So, C earns Rs20 – so option C is correct!