The least whole number which when subtracted from both the terms of the ratio 6 : 7 to give a ratio less than 16 : 21, is  Choose the most appropriate option:
A) 3 B) 4 C) 5 D) 6 E) 7
Explanation:   Let x is subtracted.   Then,   (6−x)/(7−x)&lt; 16/21   21(6—x)&lt;16(7—x)   =&gt;5x&gt;14=x&gt;2.8   Least such number is 3   Option 3
<result>A</result>
The least whole number which when subtracted from both the terms of the ratio 6 : 7 to give a ratio less than 16 : 21, is