Question
The average age of a group of 10 people is 50 years. If
the oldest person leaves the group, the average age of the remaining group decreases by 2 years. What was the age of the person who left?Solution
Let the age of the oldest person be y years. Total age of 10 people = 10 x 50 = 500 years. After the oldest person leaves, the average age of the remaining 9 people is 50 - 2 = 48 years. So, total age of remaining 9 people = 9 x 48 = 432 years. Now, Age of the oldest person = Total age of 10 people - Total age of 9 people. y = 500 - 432 = 68 years.
{(522 – 482 ) ÷ (27 + 73)} × 35 = ?% of 175
800 + 900 X (3)-2 - ? = 25 X 60 ÷ 2Â
60 = (? x 10 + 250)/5
What will come in place of (?) question mark in the following expression.
5(1/4) + 3(1/2) - 2(1/8) = ?
9/5 × 18/25 ÷ 42/21 = ? - 82/75
What will come in the place of question mark (?) in the given expression?
{(6000 ÷ 20 of 15) × 24 + 240} = ? % of 1200
If 840 ÷ 12 + 1025 ÷ 25 - n + 45 × 4 = 960 ÷ 16 × 132 ÷ 44, then the value of n is:
{(700 ÷ 20) × 40} – 30 × 18 = ?% of 1000
Evaluate
50 ÷ 5 of 4 of [9 ÷ 3 of (8 ÷ 4 + 4)] + (6 ÷ 3 + 3)
104 × 21 ÷ 13 + ? % of 300 = 320 + 22
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