a) \(\frac{7}{24}\) \(+\) \(\frac{13}{6}\) \(=\) \(\frac{7}{24}\) \(+\) \(\frac{52}{24}\) \(=\) \(\frac{59}{24}\)

b) \(\frac{12}{49}\) \(-\) \(\frac{1}{7}\) \(=\) \(\frac{12}{49}\) \(-\) \(\frac{7}{49}\) \(=\) \(\frac{5}{49}\)

c) \(\frac{5}{8}\) \(\times\) \(\frac{24}{25}\) \(=\) \(\frac{5 \times 24}{8 \times 25}\) \(=\) \(\frac{3}{5}\)

d) \(\frac{38}{21}\) \(:\) \(\frac{19}{3}\) \(=\) \(\frac{38}{21}\) \(\times\) \(\frac{3}{19}\) \(=\) \(\frac{38 \times 3}{21 \times 19}\) \(=\) \(\frac{2}{7}\)

a,10 b,4 c,30 d,40

a, 2228655

b, 13265