how do i solve para jumblings easily?
The analysis of recently held CBSE exam shows that Chennai Zone, Delhi Zone and Ajmer Zone have performed the best. The average marks of the Ajmer Zone & Delhi Zone put together is 71%. The average marks of Chennai Zone & Delhi Zone put together is 76% and the average marks of Chennai Zone & Ajmer Zone put together is 79%. What is the range of the average marks of all the three zones ( N ) put together. a) 71%<N<78% b) 70.5%<N<77.5% c) 73.5%<N<77.5% d) 73%<N<79%