Question

please help me solve this problem ​

Answer 1

Answer:

Rewa scored 83% marks.

Average in English and Social Science is 76.

Let english marks be x and social science marks be y.

$\frac{x+y}{2} = 76\\\\ (x+y)=152$

Let maths marks be z and science marks be a.

$\frac{x+y+z+a}{100X4} X 100 = 83\\\\ \frac{152+z+a}{400} X 100 = 83\\\\\frac{152+z+a}{4} = 83\\\\ 152+z+a= 332\\\\ z+a=180$

Average of Maths and Science = $\frac{z+a}{2} =\frac{180}{2}= 90$.