Subject :IMO Class : Class 4

Find the total weight of Q and R.

A55 kg

B45 kg

C85 kg

D50 kg

Solution can be much easier when we add all the 4 equation, which gives3 (P Q R S)=345; I.e., P Q R S=115; now subtracting each equation from this we can get the values of p=25; q=15; r=35 and s=40; which means q r=50