Question
Of the four numbers, whose average is 75, the first is
one-fourth of the sum of the last three. The first number isSolution
Let numbers be a, b, c & d Now according to the question, (a + b + c + d)/4 = 75 or a + b + c + d = 300 ................ (1) a = (1/4) (b + c + d) or b + c + d = 4a .......................... (2) Putting equation (2) in equation (1), we will get a + 4a = 300 or 5a = 300 or a = 60
40 30 20 ? 7.5 4.375
1 1 8 4 27 9 ?
...5 11 32 65 ? 389
...157, 159, 189, 319, ‘?’, 1 407 , 2749
15 12 ? 9 21 6
...7 6 45 40 312 ...
95 110 128 ? 181 222
...12 3 15 ? 153 756
...A restaurant has a special offer where a family meal costs ₹1,200 for 4 people. If a family of 6 orders this meal and then orders 2 additional family ...
9 134 170 ? 577 1306
...
