Question
An alloy is made of 45% lead, 35% tin, and 20% copper.
How much lead should be added to 40 kg of the alloy so that the new alloy contains 55% lead?Solution
ATQ,
Quantity of the alloy = 40 kg
Quantity of lead in 40 kg alloy = (0.45 × 40) = 18 kg
Quantity of tin in 40 kg alloy = (0.35 × 40) = 14 kg
Quantity of copper in 40 kg alloy = (0.20 × 40) = 8 kg
Let the quantity of lead to be added be x kg.
According to the question,
Quantity of lead in the new alloy = (Quantity of tin + Quantity of copper)
(18 + x) = (14 + 8)
Or, x = 22 - 18 = 4
In these questions, relationship between different elements is shown in the statements. The statements are followed by conclusions.
Statements:...
Statements: Q $ W, W % E, E @ K
Conclusions: a) Q $ K b) W @ K
Statements: E & F, H # I, G $ F, E % D, G @ H
Conclusions:
I. D $ F
II. F @ I ...
Statements: A > B > C, C < D > E, E = F > G
Conclusion:
I. C = G
II. A > F
Statements:
E ≤ A > J ≥ L; Y > J < D
Conclusions:
I. D > L
II. A > L
In which of the following expressions will the expression ‘ Q > B ’ be definitely true?
Statements: K * D, D $ N, N % M, M © W
Conclusions: I.M % W II.M $ W III.N @ D�...
What should come in the place of question mark (?) in the given expression so that the expression T > Z is definitely true and Y ≥ W is definitely...
In the question, assuming the given statements to be true, find which of the conclusion (s) among given two conclusions is/are definitely true and then...
Statements:
P > Q ≥ M ≤ N; Y ≥ Z ≥ A = P
Conclusion:
I. Y > N
II. N ≥ Y
