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
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.
Raj borrows Rs.8,000; out of which Rs. 4500 at 5% and the remainder at 6%. Find the total interest paid by him in 4 years.
At what rate percent of simple interest will the interest on Rs.3750 be one-fifth of itself in 4 years? To what will it amount in 15 years?
Vinita deposited Rs. 15000 in a bank for one year at an interest rate of 7 p.c. p.a. How much interest will she get at the end of the year?
In What time will ₹ 16,500 amount to ₹ 22,935 at 13% per annum?
Given the principal = Rs 40,000, rate of interest = 8% p.a. compounded annually. Find
- Interest if period is one year.
- Principal for 2nd year.
- Interest for 2nd year.
- Amount if period is 2 years.
The sum which will earn a simple interest of ₹ 126 in 2 years at 14% per annum is ______.
Amount obtained by depositing ₹ 20,000 at 8% per annum for six months is ______.
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.
The simple interest on a certain sum for 8 years at 12 per cent per annum is ₹ 3120 more than the simple interest on the same sum for 5 years at 14 per cent per annum. Find the sum.
