Sum of two positive numbers are multiplied by each number separately. The products thus obtained are 510 and 390. What is the difference of the two numbers?

Options
- 2
- 5
- 3
- 4

CORRECT ANSWER : 4

Discussion Board
Answer

Ans : 4
x+y=a -> equation (1)
a*x=510 a*y=390
x=510/a y=390/a
submit x & y values in eq(1)
(510/a)+(390/a)=a
900=a^2
a=30
put a value in x & y
x=17 & y=13
x-y=17-13=4

Venu 07-28-2022 01:09 PM

Ans

Let 1rst no be x
2nd no be y
"s" is there sum
So x+y = s
According to question
s*x = 510 ...1
s*y = 390 ...2
Add equation 1 and 2
s(x+y) = 510+390
s(x+y) = 900

Because s = x+y
So (x+y) * (x+y) = 900
Now x+y = 30

From equation 1
s*x = 510
30*x = 510
x = 17

Now put the value of x in
s= x+y
30=17+y
y = 13

Difference
Ans= x-y
= 17-13=4

DONE


Parvej khan 12-8-2020 08:33 AM

aptitude

good

Mohan M 02-21-2020 09:44 AM

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