Question

average marks of One by fourth class is 85 percentage and that one by third class is 70% in the average marks of the class is 56 percentage then the average of the whole class is​

Answer 1

Step-by-step explanation:

X/4 × 85÷100 +X/3× 70 ÷ 100+ 5X/12 × 56/100÷X × 100

= 67.9

Answer 2

Step-by-step explanation:

first take LCM of 4 & 3 that is 12

so total number of students equals to 12 (assumption)

then

1/4 * 12 = 3 * 85%

1/3 * 12= 4 * 70%

then remaining 7 * 56

average= total / numbers

3*85%+4*70%+6*56%/12

that gives u 815 / 12

answer: 67.916%