Question

821-1135=? ............................

Answer 1

$frac{8}{21} - frac{11}{35} = frac{8*5}{21*5} - frac{11 * 3}{35 * 3} = frac{40}{105} - frac{33}{105} = frac{40 - 33}{105} = frac{7}{105} = frac{1}{15} =$ 15⁻¹