The total surface area of a solid right circular cylinder is 1617 cm2 . If the diameter of its base is 21 cm,when what it its volume (in cm2 ) ?(take \( \pi = \frac{22}{7} \))
A can do a work in 20 days and B can do it in 14 days.If they work together for 7 days, then the fraction of the work left is:
\(\frac{3}{10}\)
\(\frac{3}{20}\)
\(\frac{7}{20}\)
\(\frac{7}{10}\)
Sonu kumar spent 42% of his monthly income on food, 16% on rent, 10% on entertainment and 7% on travelling. But suddenly for family function, he needed Rs. 18,000 and for this he took a loan of Rs. 12,500. Find out his monthly income.
To successive discounts,the first being \(14 \frac{1}{2}\%\) were given on an article having a marked price of ₹12,500.Finally,it was sold for ₹9,405.How much was the second discount?