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30.a.0. The number of solutions of the equation2x + y = 40, where both x and y are positive integersand x Sy is :(A)7 (B)13 (0)14 (D) 181. A man row downstream at 12 km/h and upstream at8 km/h Whot in .(A)31. o2:11..toAm |
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Answer» u Mark on right answer X and y are POSITIVE so >0..2x+y=40..x can take any value from 1 to 19.. as soon as x is 20, y becomes 0..So solutions are 19..(x, y) can be (1,38);(2,36);(3,34)(4,32);(5,30)......(19,2)So ans is 18 |
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