3 years ago

Mary is five times as old as Fred. In three years Mary will be 4 times as old as Fred. Find their present ages?

Mathematics

1 answer:

igomit [66]3 years ago

5 0

ans

here let mary age be x and fred be y

1st equation

x= 5y

2nd equation

x+3 =4(y+3)

now from 1st equation putting value of x in equation 2

x+3 = 4y+12

5y+3 = 4y +12

y = 9

so fred is 9 and mary is 45

You might be interested in

The length of the base and the height of a triangle are numerically equal. Their sum is 6 less than the number of units in the a

Troyanec [42]

Base = Height, Let them be x.

$( x \times x) \div 2 = (x + x) + 6 \\ x ^{2} \div 2 = 2x + 6 \\ \frac{1}{2} x^{2} - 2x - 6 = 0$
Solve quadratic equation:
x=6, x=-2(rejected because base and height is positive)

6x6/2 =18

6 0

3 years ago

What is the length of the hypotenuse? 55 ft and 48 ft

34kurt

Answer:

$\sqrt{55^2+ 48^2} = 73$

Step-by-step explanation:

$c=\sqrt{a^2 + b^2}$

6 0

2 years ago

Which choice represents the fraction below as a single exponential expression?

lyudmila [28]

the correct answer would be A. 8^-12

8^2 /8^16 = 1/8^14 = 2.27373*10^-13

8^-12 = 1.45519*10^-11

which are equal so answer is A

4 0

3 years ago

The domain of a function is? When it includes all real numbers

Ray Of Light [21]

Domain is x values... Y is y values

6 0

3 years ago

3*(2)=6+5 3*(2+5)<br> Please help

Lina20 [59]

Answer:

6 = 413 is a not true statement

Step-by-step explanation:

I've attached my work below

Hope it helps, Let me know if you have any questions/concerns !

Have a nice rest of your day :)

4 0

2 years ago