Elitmus Exam Numerical Ability Ratio and Proportion

gold is 19 times as heavy as water and copper is 9 times as heavy as water .in what ratio should these be mixed to get an alloy 15times as heavy as water?

Read Solution (Total 3)

19 9
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/
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15
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6 4
3 2

but in mass 3*19:2*9
19:6 ans
7 years agoHelpfull: Yes(2) No(4)

X(g) + Y(c) = (X+Y)*15w
X(19w) +Y(9w) = 15(X+Y)w
19X +9Y =15X +15Y
4X = 6Y
Thus X:Y = 3:2
5 years agoHelpfull: Yes(2) No(0)
19 9
15

(19-15):(15-9)
=4:6
6 years agoHelpfull: Yes(0) No(2)

Elitmus Other Question

a liquid p is 10/7 times heavy as water and water is 7/5 times as heavy as another liquid q.the mount of p that must be added to 7 liters of liquid q so that the mixture weighs as much as an equal volume of water will be two blends of a commodity costing rs 35 and rs 40 per kg respectively are mixed in the ratio 2:3 by weight.if 1/5th of the mixture is sold at rs46 per kg and the remaining at the rate of rs 55 per kg,the profit percent is