Question

Answer 1

\(\left(\dfrac{7}{15}+\dfrac{8}{15}\right)+\left(\dfrac{9}{16}+\dfrac{7}{16}\right)=\dfrac{15}{15}+\dfrac{16}{16}=1+1=2\)

Answer 2

2

Answer 3

\(\dfrac{7}{15}+\dfrac{8}{15}+\dfrac{9}{16}+\dfrac{7}{16}=\left(\dfrac{7}{15}+\dfrac{8}{15}\right)+\left(\dfrac{9}{16}+\dfrac{7}{16}\right)=\dfrac{15}{15}+\dfrac{16}{16}=1+1=2\)