Osmotic pressure of $30\%$ solution of glucose is $1.20$ atm and that of $3.42\%$ solution of cane sugar is $2.5$atm. The osmotic pressure of the mixture containing equal volumes of the two solutions will be:

When equal volumes of the two solutions are mixed, the osmotic pressure of the resulting mixture is the average of the two individual pressures because the final volume is twice the initial volume of each component. We calculate the average by adding 1.20 atm and 2.5 atm to get 3.7 atm, and then dividing by 2. The resulting osmotic pressure of the mixture is 1.85 atm.

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