$\left\{\begin{array}{ccc}x+2y=4&\text{multiply both sides by 5}\\4x-5y=42&\text{multiply both sides by 2}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}5x+10y=20\\8x-10y=84\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad13x=104\qquad\text{divide both sides by 13}\\\\\boxed{x=8}\\\\Answer:\ \boxed{\boxed{x=8}}$

5 0

3 years ago

Johnny spend 1/7 of his income on Food, 1/10 of his income on gas, and 3/8 of his income on rent. What percentage of his income

Agata [3.3K]

Answer:

38.2%

Step-by-step explanation:

1/7 ≈ 14.29%

1/10 = 10.00%

3/8 = 37.50%

The total that Johnny has allocated for food, gas, and rent is ...

14.29% + 10.00% + 37.50% = 61.79%

So, the remaining amount is ...

100% -61.79% = 38.21%

About 38.2% of Johnny's income remains.

7 0

3 years ago

What is 20/5 in simplest form?

Anna007 [38]

It would be equal to 4

Hope this helps!

5 0

3 years ago