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, and in the bracket, 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. (562.5×6)4 ÷ (135÷9)2 × (37.5×6)5 = (3.75×4)(5−?) ⇒ (3375)4 ÷ (15)2 × (225)5 = (15)(5−?) ⇒ (15)12 ÷ (15)2 × (15)10 = (15)(5−?) ⇒ (15)20 = (15)(5−?) ⇒ 5 – ? = 20 ⇒ ? = -15