Answer:
.
Step-by-step explanation:
It is given that the sum of 10 and one-third of a number is 25.
Let as consider n be the unknown number.
One-third of a number
Sum of 10 and one-third of a number
The sum of 10 and one-third of a number is 25. It can be written as
Therefore, the required equation is
.
The present age of Jane is 45 years old and present age of her sister is 9 years old
<em><u>Solution:</u></em>
Let the present age of Jane be "x"
Let the present age of her sister be "y"
<em><u>Jane is 5 times older than her sister</u></em>
present age of Jane = 5(present age of her sister)
x = 5y ---------- eqn 1
<em><u>In 3 years, Jane’s sister will be 1/4 her age</u></em>
Age of sister after 3 years = 3 + y
Age of jane after 3 years = 3 + x
Age of sister after 3 years = 1/4(age of jane after 3 years)

Substitute eqn 1 in above equation

Substitute y = 9 in eqn 1
x = 5(9)
x = 45
Thus present age of Jane is 45 years old and present age of her sister is 9 years old
No solution
Ex:
Simply 2.40+1.8 to 4.2
<h3><em><u>given</u></em></h3>
<em><u>5m</u></em><em><u> </u></em><em><u>long</u></em><em><u> </u></em><em><u>ladder</u></em><em><u> </u></em><em><u>placed</u></em><em><u> </u></em><em><u>against</u></em><em><u> </u></em><em><u>4.3m</u></em><em><u> </u></em><em><u>up</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>wall</u></em><em><u>.</u></em>
<h3><em><u>to</u></em><em><u> </u></em><em><u>find</u></em><em><u>:</u></em></h3>
<em><u>the</u></em><em><u> </u></em><em><u>angle</u></em><em><u> </u></em><em><u>between</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>ladder</u></em><em><u> </u></em><em><u>and</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>ground</u></em><em><u>.</u></em>
<h3><em><u>solution</u></em><em><u>:</u></em></h3>
<em><u>Based on the given conditions, formulate: </u></em>
<em><u>sinx=4.3÷5</u></em>
<em><u>Evaluate the equation/expression</u></em><em><u>:</u></em>
<em><u>x</u></em><em><u>=</u></em><em><u> </u></em><em><u>1.0352</u></em><em><u>7</u></em><em><u> </u></em><em><u>or</u></em><em><u> </u></em><em><u>2.10</u></em><em><u>6</u></em><em><u>3</u></em><em><u>2</u></em>
<em><u>x= 1.03527</u></em><em><u>°</u></em>
<em><u>or</u></em><em><u> </u></em><em><u>x</u></em><em><u>=</u></em><em><u> </u></em><em><u>2.10632</u></em><em><u>°</u></em>