Science and Mathematics for Engineering 6th Edition by John Bird

Exercise 17

Calculate: (a) $\frac { 1 } { 4 } \times \frac { 2 } { 5 } - \frac { 1 } { 5 } \div \frac { 2 } { 3 } + \frac { 4 } { 15 }$
(b) $\frac { \frac { 2 } { 3 } + 3 \frac { 1 } { 5 } \times 2 \frac { 1 } { 2 } + 1 \frac { 1 } { 3 } } { 8 \frac { 1 } { 3 } \div 3 \frac { 1 } { 3 } }$