Question
A spherical balloon is being inflated such that its
radius is increasing at a rate of 2 cm per second. After 5 seconds, find the volume of the balloon. (Use π = 3.14)Solution
Radius after 5 seconds = 2 × 5 = 10 cm Volume of sphere = (4/3)πr³ = (4/3) × 3.14 × (10)³ = (4/3) × 3.14 × 1000 = 4186.6 cm³.
A woman invests Rs. 2000 at the start of each year at 5% compound interest per annum. How much will her investments be at the end of the 2nd year?
If the ratio of the sum invested and simple interest received after 1 year is 25:11 respectively, then find the rate of interest.
Raman paid Rs.9,600 in interest on a loan she obtained 5 years ago with a simple interest rate of 16%. What was the amount of the loan she had taken?
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A man, after making the first investment, earned a total interest of Rs. 1,09,200 at the end of 3 years. He invested a certain amount at an annual compo...
Rs. (n + 400) invested on simple interest amounts to Rs. 3,200 and Rs. 3,800 in 4 years and 6 years, respectively. Find the value of 'n'.
Rs. ‘P’ was invested in scheme A at the rate of 30% per annum on compound interest for 3 years. Rs. (P+9875) was invested in scheme B at the rate of...
