There are 2 numbers whose sum is 53. 3 times the smaller number is equal to 19 more than the larger number. Which are the numbers?

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hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

assume that the fsmaller number =S and the larger number is=L

then, S+L= 53....... (1)

3 times the smaller number = 19 more than the larger number

==> 3 S = 19 + L ........ (2)

Now, combining equation (1) and (2) we have:

S+L = 53

3S = 19  + L ==> L = 3S -19

substitute in eqution (1),

 S + (3S- 19) = 53

 4S - 19 = 53

4S = 72     divide by 4

S = 72/4 = 18

and L = 3(18)- 19 = 35

 

pohnpei397's profile pic

pohnpei397 | College Teacher | (Level 3) Distinguished Educator

Posted on

The larger number is 35 and the smaller number is 18.  Here is how to find this.

Let X be the smaller number and Y be the larger.

x + y = 53

3x = y + 19

Let us solve for y in the first equation.

y = 53 -x

Then let us substitute that for y in the second equation.

3x = 53 - x + 19

3x = -x + 72

4x = 72

x = 18

If x = 18

18 + y = 53

y = 35

Top Answer

giorgiana1976's profile pic

giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted on

Put a=the smaller number and b=the larger number.

Their sum is 53.

a+b=53  (1)

Now we'll write the constraint: 3 times smaller is equal to 19 more than larger.

3a = b+19

3a-b = 19  (2)

If we'll add (1) to (2), we'll have:

a+b+3a-b = 53+19

4a = 72

a = 18

If we'll substitute the value for a in equation (1), we'll get:

a+b = 53

18+b = 53

b = 53-18

b = 35

neela's profile pic

neela | High School Teacher | (Level 3) Valedictorian

Posted on

Let x and y be the 2 numbers . So by data x+y =53.....(1)

If x is smaller number, the 3x = y+19....(2)  From (2) we get:

3x-y = 19....(3)

x+y = 53...(1)

(1)+(2) gives: 4x = 19+53 = 72.. Or  x= 72/4  = 18 is the smaller number and  y= 53-x = 53 -18 =35.

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