Question
A chemist has 40 litres of a 25% acid solution. How many
litres of a 60% acid solution must be added so that the resulting mixture has 40% acid?Solution
Let x litres of 60% solution be added. Pure acid initially = 25% of 40 = 10 litres Pure acid added = 60% of x = 0.6x litres Total acid = 10 + 0.6x Total volume = 40 + x Required concentration = 40%: (10 + 0.6x) / (40 + x) = 0.4 10 + 0.6x = 0.4(40 + x) 10 + 0.6x = 16 + 0.4x 0.6x − 0.4x = 16 − 10 0.2x = 6 ⇒ x = 30 litres.
In the question, assuming the given statements to be true, find which of the conclusion (s) among given three conclusions is /are definitely true and t...
In the question, assuming the given statements to be true, find which of the conclusion (s) among given three conclusions is /are definitely true and t...
Statements: Z % Y; X # W; U % V; W & V; Y @ X
Conclusions:Â Â Â Â Â
I. U @ X Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ...
Statements: Â Y $ Z, H $ D, Z * D
Conclusions: Â Â Â Â a) Y & HÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â b) Y * D
...In the question, assuming the given statements to be true, find which of the conclusion (s) among given three conclusions is /are definitely true and t...
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 the...
Statements:
L ≥ M = N < P; O < Q ≥ R =S ≥ L
Conclusions:
I). Q > M
II). Q = N
Statement: F < G < H ≥ J; F ≥ K > L
Conclusion:
I. H > L
II. H = L
Statement: X > W = P; X > G > F; X < O
Conclusion: I. F < W      II. P ≤ F
Statements: J < K; L = M; K >N ≥ L
Conclusions:
I. J < L
II. N = M
