Question

1) Ander thinks of a number. He multiplies it by 5 then adds 10. The answer
is 20. What number did he think of? *​

Answer 1

Answer:

7 is the answer Let the number mia thinks be x

According to the question,

⇒5x−10=2x+11

⇒3x=21

∴x=7

​  

 

Answer 2

⛦ Given :

• Ander multiplies a number by 5
• And add 10
• The answer is 20

⛦ To find :

• The number he thought

⛦ Solution :

Let the number thought by Ander be x

Then he multiplies the number by 5

So, now the number is x(5) = 5x

Now ,he adds 10 to the number

So the final number is 5x + 10.

According to Question :

↛ 5x + 10 = 20

↛ 5x = 20 - 10

↛ 5x = 10

↛ x = 10/5

↛ x = 2

Thus, the number thought by Ander is 2.

____________________

Let's check the answer, and verify whether the number we got is correct or not.

So,

•5x + 10 = 20

Putting the value of x

⇢ 5(2) + 10 = 20

⇢ 5 × 2 + 10 = 20

⇢ 10 + 10 = 20

⇢ 20 = 20

Thus, R.H.S = L.H.S

Hence, answer is correct.