(a) Given Ragi flour: raw rice = 4 : 1
If one cup of ragi flour used then the ratio of ragi flour : raw rice = 44:14=1:14
Raw rice required = 14 cup
(b) Ratio of water : ragi flour = 8 : 4
If 16 cups of water used then ratio of water : ragi flour = 8 × 2 : 4 × 2 = 16 : 8
8 cups of ragi flour are used.
(c) We know that the quantities of the same units can be compared. Here Ragi flour, Raw rice and water are in one unit, Sesame oil and salt are in different units, these different units cannot be compared and cannot be expressed as a ratio.