Answer for 7and8...........
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and then add the lcm by 7
35 = 5 x 7
56 = 2 x 2 x 2 x 7
91 = 7 x 13
LCM = 7 x 5 x 2 x 2 x 2 x 13 = 3640
The smallest number that when divided by 35, 56, 91 leaves a remainder 7 in each case = 3640 + 7 = 3647.
2)lets say the 4 numbers are: a-3d, a-d, a+d, a+3d
where sum of 4 terms = 32,
hence 4a = 32, implies a = 8;
according to question:
(8-3d)(8+3d)/(8-d)(8+d) = 7/15
solving we get answer: 2,6,10,14