Let the present ages of ‘A’, ‘B’ and ‘C’ be ‘7x’ years, ‘8x’ years and ‘9x’ years, respectively. ATQ; (9x + 7x) ÷ 2 = 32 Or, 16x = 64 So, x = 4 So, present age of ‘C’ = 9 × 4 = 36 years Present age of ‘B’ = 8 × 4 = 32 years Difference between the ages of ‘B’ and ‘C’ = 36 – 32 = 4 years So, age of ‘B’ when ‘C’ was 21 years old = 21 – 4 = 17 years
14 36 80 168 ? 696
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
47, 72, 122, ?, 297, 422
150, 158, 131, 195, 70, ?
324 972 486 1458 729 ?
...140, 146, 158, 176, ?, 230
45, 166, 607, 1568, 3249, ?
1000 100 20 ? 2.4 1.2
289 169 121 ? 25 9
...415 246 367 ? 335 310
...