Question

If 10 added to four times a number,the results is 5 less than five times the number . Find the number?
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Answer 1

Step-by-step explanation:

If 10 be added four times a certain number, the result is 5 less than five times the number. Find the number. Let the number be "x",then as per question 10 added 4x times is 40x, which is equals to 5x-5. We get 40x=5x-5.

Answer 2

We have 3x + 2y = 12

On cubing both sides, we have

⇒ (3x + 2y)3 = 123

⇒ (3x)3 +(2y)3 + 3 × 3x × 2y(3x + 2y) = √728

⇒ 27x3+ 8y3 + 18xy(3x + 2y) = √728

⇒ 27x3+ 8y3 + 18 × 6 × 12 = √728

⇒ 27x3+ 8y3 + 1296 = √728

⇒ 27x3+ 8y3 = √728 – 1296

⇒ 27x3+ 8y3 = 432