Problems based on Numbers Test 7

Question : 3 of 18

Marks: +1, -0

If doubling a number and adding 20 to the result gives the same result as multiplying the number by 8 and taking away 4 from the product. What is the number?

Validate

Solution:

Let the number be x; then

2x + 20 = 8x - 4

⇒ 6x = 24

⇒ x = 4

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