If y + then find out the value of :
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Solution
y + [Multiply by 2 both sides]
2y +
⇒ ∴ 8y3 + = (2)3 – 3(2)
= 2
40 men can cut 60 trees in 8 hrs. If 8 men leave the job, how many trees will be cut in 12 hours ?
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Solution
32 men working 12 hrs cut trees
=
= 72
A Purchased 150 kg of wheat at the rate of Rs. 7 per kg. He sold 50 kg at a profit of 10%. At what rate per kg should he sells the remaining to get a profit of 20% on the total deal?
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Solution
Total selling price for 20% profit
= 15 × 7 ×
Selling price of 50 kg = 50 × 7 × = Rs. 385
∴ Selling price per kg of remaining 100 kg wheat
= = 8.75 Rs./kg
If x – then find out the value of
-
Solution
x –
x2 +
= 49 + 2 = 51
If by selling an article for Rs. 390 a shopkeeper gains 20%. Find the cost price of article.
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Solution
Cost price = = Rs. 325
A dishonest dealer professes to sell his goods at cost price, but he uses a weight of 900 gm for the kg weight. Find his gain percent.
-
Solution
% Profit =
A candidate who gets 30% of the marks in a test fails by 50 marks. Another candidate who get 300 marks fails by 50 marks. Find the maximum marks.
If x + = 7 then find out the value of x2 +
-
Solution
x +
∴ x2 + = (7)2 – 2
x2 + = 47
A, B and C invested capitals in the ratio 2 : 3 : 5, the timing of their investments being in the ratio 4 : 5 : 6. In what ratio their profit be distributed?
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Solution
Ratio of profit = 2 × 4 : 3 × 5 : 5 × 6
= 8 : 15 : 30
If A : B = 3 : 5 and B : C = 2 : 3 then find out the ratio of A : B : C.
-
Solution
A : B = 3 : 5
B : C = 2 : 3
∴ A : B : C = 6 : 10 : 15