the average age of 12 children is 20 years. If the age of one more child is added, the average decreased by 1. What is the age of child added later?

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উত্তর: 7

Average of 12 is 20 Total = 12 × 20 = 240 Let the age of one more is x So, total 240 + x Average of 13 is (240 + x)/13 ATQ (240 + x)/13 = 19 or, 240 + x = 13 × 19 or, 240 + x = 247 ∴ x = 7 (ans)

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the average age of 12 children is 20 years. If the age of one more child is added, the average decreased by 1. What is the age of child added later?

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If u> t, r> q , s>t, t>r, which of the following must be true?

The price of a certain television set is discounted by 10 percent, and the reduced price is then discounted by 10 percent. The series of successive discount is equivalent to a single discount of -

A pen was sold at 15% loss. If the selling price was Tk. 8 more, than the seller could have made a profit of 10%. What was the purchase price of pen?

Ms. Lyla wants to put up fencing around three sides of her rectangular garden and have a side of 20 meter unfenced. If the yard has an area of 680 square meters, how many yards of fencing does she need?

The difference between two numbers is 7 and their product is 60, then one of the two numbers must be -

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In a sugar-water solution, the ratio of water to sugar is 8:3. If you add 2 Kgs of sugar, the ratio become 2:1. What was the amount of sugar in the original solution?

If the area of rectangle R with length 4 feet is equal to the area of square S, which has a perimeter of 24 feet , then the perimeter of rectangle R equals -

What percent of 25 is 0.20?

If N and P are both odd numbers, which of the following numbers must be an even number?