1.

1). 2/42). 3/53). 1/24). 10

Answer»

81/90 × 10/3 × 9/18 × 2/5

= $(\frac{{81{\RM{\;}} \TIMES {\rm{\;}}10{\rm{\;}} \times {\rm{\;}}9{\rm{\;}} \times {\rm{\;}}2}}{{90{\rm{\;}} \times {\rm{\;}}3{\rm{\;}} \times {\rm{\;}}18{\rm{\;}} \times {\rm{\;}}5}})$

= $(\frac{{81{\rm{\;}} \times {\rm{\;}}9{\rm{\;}} \times {\rm{\;}}2}}{{9{\rm{\;}} \times {\rm{\;}}3{\rm{\;}} \times {\rm{\;}}18{\rm{\;}} \times {\rm{\;}}5}})$

= $(\frac{{27{\rm{\;}} \times {\rm{\;}}2}}{{18{\rm{\;}} \times {\rm{\;}}5}})$

= $(\frac{{3\; \times \;2}}{{2\; \times \;5}})$

= 6/10 = 3/5


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