Nomor 3-4 tolong ya plis

Nomor 3-4 tolong ya plis

No. 3
$13 frac{1}{2} + 2 frac{2}{3} - 9 frac{1}{4} + 1 frac{1}{3} \ = frac{27}{2} + frac{8}{3} - frac{37}{4} + frac{4}{3} \ = frac{162 + 32 - 111 + 16}{12} \ = frac{99}{12} \ = 8 frac{3}{12} \ = 8 frac{1}{4}$
jawab: B

No. 4
$2 frac{1}{2} + 3 frac{1}{3} - 4 frac{1}{4} \ = frac{5}{2} + frac{10}{3} - frac{17}{4} \ = frac{30 + 40 - 51}{12} \ = frac{19}{12} \ = 1 frac{7}{12}$
jawab: B