NTSE Stage 2 MAT 2015 Question Paper

According to question
   $5\mathrm{e}+75+9\mathrm{p}=100$
and   $2\mathrm{e}+65+10\mathrm{p}=80$
Here e = eraser
   s = sharpener
   p = pencil
Equation $\left(\mathit{i}\right)\times 2-\left(\mathit{i}\mathit{i}\right)$
   $8\mathrm{e}=85=8\mathrm{p}=120$
∴  $\mathrm{e}+\mathrm{s}+\mathrm{p}=15$
So, the total cost of one eraser, one sharpner and one pencil is ₹15.