Robi has 10 pairs of matched socks. If he loses 7 individual socks, what is the greatest number of pairs of matched socks he can have left?
সমাধান
সঠিক উত্তর: Option B
"individual" just means 1. It doesn't mean that we are selecting exactly 1 sock from each pair. It just means that we are removing 7 socks.
John has 10 pairs of socks. Convert to actual socks. 20 actual socks. He loses 7. He only has 13 socks left. He needs two/pair. 13/2 is 6.5 pairs. He can only, at most have 6 pair.
