Question
In an Aerobic class, the average age of all the members
was 54.5 years, 11 members left the class and 7 new members joined. If the average age increased by 3 years and the total age decreased by 140, what was the number of members in the class initially?Solution
Let the original member be x Total age of these members = 54.5x Total age of (x – 4) members = (54.5x  – 140) years According to the question,  54.5x  – 140 = (x  – 4) `xx` 57.5 ⇒ 54.5x  – 140 = 57.5x  – 230 ⇒ 57.5x  – 54.5x  = 230 – 140 ⇒ 3x = 90  x = 30
Two trains, 'P' and 'Q', are moving with speeds of 16 m/s and 24 m/s, respectively. The lengths of the trains are in the ratio 3:...
What approximate value will come in place of question (?) in the following given expression? You are not expected to calculate the exact value.
...
15.03% of (619.87 × 7) + (√399.63 × 16.11) ÷ 5 = ?
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
362, 452, 550, 656, 770, 892, ?
600.11 ÷ 14.98 x 5.14 – 171.9 = √?Â
3.55% of 8120 – 66.66% of 540 = ? – 28% of 5500
? = 49.83% of 39.72% of (45.011.99 – 4.98 2.04)
? + 157.99 – 101.01 = 25.01 × 5.98
