Skip to main content

Aptitude Day 326

Problems on Percentage:

1. A student’s mathematics test had 80 problems. i.e., 20 arithmetic, 40 algebra and 20 geometry problems.  Although she answered 60% of the arithmetic, 40% of the algebra and 40% of the geometry problems correctly, she did not pass the test because she got less than 60% of the problems right. How many more questions she would have needed to answer correctly to earn a 60% passing grade?

Solution:
                  Number of questions attended correctly = 60% of 20 + 40% of 40 + 40% of 20 
                                                                                   = 60/20 + 40/40 + 40/20
                                                                                   = 3+1+2 = 6.

                  60% of 80 = 48.

                   Required number of questions = 48-6 = 42.

2. If 60% of (x-y) = 40% of (x+y), then what percent of x is y?

Solution:
                 60/100*(x-y) = 40/100* (x+y)

                 By solving this equation, we get x = 5y.

                y/x * 100 = y/5y * 100 = 20%.



Comments

Popular posts from this blog

Aptitude Day 59

Answers of Day 58:     1. 1/90.     2. 20 Problems to solve: 1. The product of two numbers is 33 and the sum of their squares is 130. Find their difference. 2. The sum of two numbers is 100 and their difference is 20. Find their product.

Why Procrastinating for the first time is good for you?

    Why Procrastinating for the first time is good for you?       Hello everyone. What's up? Are you working on your goals effectively? Hope you're doing well. Let's get into the topic  Why Procrastinating for the first time is good for you? . . . Curious... Isn't it?          As I told you in my earlier post , I've learnt a lot in the last year. Today's post is about the things which I've learnt after I procrastinated my works. Not only I've learnt a few things but also I've developed some good attitudes. I've listed a few. ·         You'll come to know your capacity  ·         You'll overcome your laziness ·         You'll push into the habit of prioritizing even if you're really bad at it ·         You'll get to know your best time management skills ...