Question
Average of 8 students is 15 years. If two more students
of age 20 and 10 years join. What will be the new average age?Solution
Average = Sum of ages / Total number of students 15 = x / 8    => x = 120 Two more students of 10 and 20 years are added. So, => x = 120 + 20 + 10 => x = 150 ∴ The new average = 150/10 = 15 ∴ The new average is also 15. Thus, it remains same.
- 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.)
12.5% of 6400 + (17 × 25) = ?% of 2200+ 125Â
What approximate value will replace the question mark (?) in the following?
? –...
? * 7.05 = (360.06 ÷ 11.02) % of 4290 - 759.91
Solve the following expression and calculate the approximate value.
1727.8 + 2196.75 + 3 × 11.8 × 12.9 × 24.75
49.99% of 639.99 + 159.98% of 49.99 = ?2
19.99% of 79.98 = ?2– 159.99% of 12.5
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.)...
570.11 ÷ 18.98 × 5.14 – 123.9 = √?Â
What approximate value should replace the question mark?
9.96% of 1200.10 − 25% of 4800 = ? − 7000.20
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