Question 21: Calculate the value of the expression \(M = \left( {{7 \over 4} – 2.8} \right):\left( {2{3 \over 4} + 0.125} \right)\ )

\(\eqalign{ & M = \left( {{7 \over 4} – 2.8} \right):\left( {2{3 \over 4} + 0.125} \right) = \left( {{ 7 \over 4} – {{14} \over 5}} \right):\left( {{{11} \over 4} + {1 \over 8}} \right) \cr & = \left( { {{35} \over {20}} – {{56} \over {20}}} \right):\left( {{{22} \over 8} + {1 \over 8}} \right) \ cr & = {{ – 21} \over {20}}:{{23} \over 8} \cr & = {{ – 21} \over {20}}. {8 \over {23}} = {{ – 42} \over {115}} \cr} \)