Skip to main content

Aptitude Day 91


Ratio and Proportion:

1. An alloy is to contain copper and lead in the ratio 3:5. The required to be melted with 27 kg of copper is:

Solution:
               Let the required lead to be melted be x.
               3:5 :: 27:x
               3x = 5*27
               x = 45.  

2. 40 kg of an alloy X is mixed with 90 kg of alloy Y. If alloy X has zinc and tin in the ratio 2:3 and alloy Y has tin and lead in the ratio 4:5, then the amount of tin in the new alloy is :

Solution:
                Let the amount of tin in the new alloy be a.

                Amount of tin in X and Y:
                (40/5)*3 = 24. (In alloy X)
                (90/9)*5 = 50. (In alloy Y)

                a = 24+50
                   = 74.

Comments

Popular posts from this blog

Vocabulary Day 21

Stammer Thesaurus: Verb : stutter in speech, speak haltingly, speech defect           halt, hesitate, pause, stop, sputter... Antonyms : say quickly, pronounce, enunciate... Example sentences: ·          He was stammering when the teacher caught him red-handed. ·          One should avoid the stammering while delivering a speech. 

Aptitude Day 47

Problem On Numbers 1. Three numbers are in the ratio 1:2:3 and their average is 180. What's the largest number? Solution:                 Let the numbers be x, 2x and 3x.                 x+2x+3x = 180                          6x = 180                            x = 30                The largest number is 3x = 90. Problem to solve: Three numbers are in the ratio of 4:2:3 and their product is 648. Find the smallest number.