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Start learning 50% faster. Sign in nowLet the smaller number be 'a' and larger number be 'b'. a + b = 20 -------- (I) And, a2 = 5b + 4 Or, a2 = 5 X (20 - a) + 4 (from equation I) Or, a2 = 100 - 5a + 4 Or, a2 + 5a - 104 = 0 Or, a2 + 13a - 8a - 104 = 0 Or, a(a + 13) - 8(a + 13) = 0 Or, (a - 8) (a + 13) = 0 So, 'a' = 8 or 'a' = - 13 But given that both are natural numbers, So, 'a' = 8 On putting value of 'a' in equation I, We get, 'b' = 20 - 8 = 12 Therefore, required product = 12 X 8 = 96
2, 20, 40, 64, 98, 144
6, 22, 76, 314, 1580, 9600
Find the wrong number in the given number series.
11, 30, 67, 133, 219, 346
10, 35, 135, 360, 760, 1136, 2285.
121, 240, 386, 555, 751, 976
53, 57, 66, 82, 117, 143, 192
Direction: Find the wrong number in given number series.
640, 663, 713, 794, 920, 1065