Advertisements
Advertisements
प्रश्न
Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in `2 1/2` kg of chalk.
Advertisements
उत्तर
We have,
Percentage of calcium in chalk = 10%
Percentage of carbon in chalk = 3%
Percentage of oxygen in chalk = 12%
∵ Weight of chalk = `2 1/2` kg
= `5/2` kg
= 2.5 kg
= 2.5 × 1000 g ...[∵ 1 kg = 1000 g]
= 2500 gm
∴ Amount of carbon in chalk = 3% of 2500 g
= `3/100 xx 2500`
= 25 × 3
= 75 g
∴ Amount of carbon in chalk = 10% of 2500 g
= `10/100 xx 2500`
= 10 × 25
= 250 g
Hence, amount of carbon and calcium are 75 g and 250 g, respectively.
APPEARS IN
संबंधित प्रश्न
Find the interest and the amount on:
₹ 5,000 at 8% per year from 23rd December 2011 to 29th July 2012.
The simple interest on a certain sum of money is `3/8` of the sum in `6 1/4` years. Find the rate percent charged.
The interest for a principle of ₹ 4,500 which gives an amount of ₹ 5,000 at end of certain period is
The value of a machine depreciates at 10% per year. If the present value is ₹ 1,62,000, what is the worth of the machine after two years?
The time period after which the interest is added each time to form a new principal is called the ______.
Simple interest on a given amount is always less than or equal to the compound interest on the same amount for the same time period and at the same rate of interest per annum.
Given the principal = Rs 40,000, rate of interest = 8% p.a. compounded annually. Find amount if period is 2 years.
Dhruvika invested money for a period from May 2006 to April 2008 at rate of 12% per annum. If interest received by her is ₹ 1620, find the money invested.
Divide ₹ 10000 in two parts so that the simple interest on the first part for 4 years at 12 per cent per annum may be equal to the simple interest on the second part for 4.5 years at 16 per cent per annum.
₹ 9000 becomes ₹ 18000 at simple interest in 8 years. Find the rate per cent per annum.
