Question

(a). If 1/2
is subtracted from a number and the difference is multiplied by 4, the result is 5. What is the number?

Answer 1

Step-by-step explanation:

Let the number be x

When subtracted 21

we get

x− 21

Multiply by 4, we get

(x− 21)×4

Adding 25, we get

4(x−21+25

Dividing by 3, we get

(4(x−21)+25)÷3

Given that the number is equal to 10

∴[4(x−21)+25]÷3=10

Multiply both sides by 3, we get

[4(x− 21)+25]÷3×3=10×3

⇒4(x− 21)+25=30

⇒4x−2+25=30

⇒4x=30−25+2

⇒4x=7

⇒x= 4/7

Answer 2

Answer:

let the number be x

x = 9/4

Step-by-step explanation:

(x - 1/2 )* 4 = 5

x - 1/2 = 5/4

x = 5/4 + 1/2

x = (5 + 4) /4

x = 9/4