Sara and Dora prefer to exports as many common products as possible in order to understand the regulatory conditions. Keeping their preferences intact, what is the maximum number of common products which can be exported by both of them?
Explanation:
2a + a – 1 + 4 + a + 2a + a – 1 + b = 30
7a + b = 28
b has to be a multiple of 7.
if b = 7, ⇒ a = 3
if b = 14, ⇒ a = 2
if b = 21, ⇒ a = 1
Given, b = even, Thus, b = 14, a = 2
Products common to M & I = 2.
Hence, option (a).
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