Aptitude Day 42

Answers of Day 41:
                                    1. 375
                                    2. 9
                                    3. 210

1.  The difference of 2 numbers is 30% of the larger number. If the smaller number is 7. What's the larger number?

Solution:
                Let the number be x.
                x-7 = (30/100)x           [Given: 30% of the largest number]
                x-(3/10)x = 7
                (10x-3x)/10 = 7
               7x= 70
                x=10.
 The number is 10.

2. If doubling a number and adding 15 to it gives the same result as multiplying that number by 9 and taking away 6 from that product, the number is:

Solution:
                Let the number be x.
                2x+15 = 9x-6
                21 = 7x
                 x = 3.
The number is 3.