Follow BODMAS rule to solve this question, as per the order given below, Step - 1 - Parts of an equation enclosed in 'Brackets' must be solved first, Step - 2 - Any mathematical 'Of' or 'Exponent' must be solved next, Step - 3 - Next, the parts of the equation that contain 'Division' and 'Multiplication' are calculated, Step - 4 - Last but not least, the parts of the equation that contain 'Addition' and 'Subtraction' should be calculated. The given expression is: ? % of 7610 + 25% of 5680 = 5225 ⇒ (?/100 × 7610) + (25/100 × 5680) = 5225 ⇒ (? × 761) + (25 × 568) = 52250 ⇒ ? × 761 = 52250 - 14200 ⇒ ? = 38050/761 ⇒ ? = 50