A discount series of 10%, 20% and 40% is equal to a single discount of:
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Solution
Single discount = %
= 56.8%
The number of sides in a regular polygon is 12. The value of its each interior angle is:-
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Solution
Each interior angle =
Rs. 425 is divided among 4 men, 5 women and 6 boys such that the share of a man, a woman and a boy may be in the ratio of 9 : 8 : 4. What is the share of a woman ?
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Solution
The ratio of shares of group of men, women and boys
= 9 × 4 : 8 × 5 : 4 × 6
= 36 : 40 : 24
∴ Share of 5 women =
∴ Share of 1 woman =
How long will a train 60 m long travelling at 40 km an hour take to pass through a station whose platform is 90 m long?
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Solution
Required time = = 13.5 sec.
If x2 + 3x + 1 = 0 then find the value of x3 + :
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Solution
x2 + 3x + 1 = 0
⇒ x +
∴ x3 + = (–3)3 – 3(–3) = –18
If 2x + then find the value of 3x + :
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Solution
2x + (multiply both side by )
⇒ 3x +
A company decreases the number of his employees in the ratio 10:9 and increases their wages in the ratio 11 : 12. What is ratio of his two expenditures?
A wholeseller sells 30 pens for the price of 27 pens to a retailer. The retailer sells the pens at the marked price. Find the percent profit of the retailer-
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Solution
% Profit =
If the CI on a certain sum for 2 years at 12% be Rs. 230, what would be the SI?
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Solution
SI = = Rs.217
At what rate percent compounded yearly will Rs. 80,000 amount to Rs. 88200 in 2 years?
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Solution
80000
⇒
r = 5%