Math Homework: Please explain in simplest terms possible! You don't need to answer all just one would be fine!

Question

Find the two digit number whose tens digits is 4 less than it units digit if the original number is 2 more than 3 times the sume of the digits. Please include how to find the two formulas to sovle this problem!

In 15 years, Maya will be twice as old as David is now. In 15 years, David will be as ol as Maya will be 10 years from now. How old are they now? Please include how to findthe two formulas to solve this problem.

The sum of Anjie's age and Carol's age is 66. Carol's age is 2 more than 3 times Anjie's age. How old are Carol and Najie?

Wymon is 20 years older than Sabrina. In 8 years, Wymon will be twice as old as abrina. How old is each now?

a coin bank contains $17 in pennies and nickels. If there are 1140 coins in the bank, hwo many coins are nickels?

Answer 1

The first one is 26

Here's how to solve it

The number N=10x+y
x=y-4
10x+y=3(x+y)+2
7x=2y+2

7y-28=2y+2
5y=30
y=6
x=2
10*2+6=26

Here's the second

M is Maya's Age
D is david's age

m+15=2D
m=2D-15

D+15=m+10
D+15=2D-15+10
20=D
m=25

The third
A=anjie
C= carol
A+C=66
C-2=3A
c=3a+2
a+3a+2=66
4a=64
a=16

The fourth
w is wymon
s is sabrina
w-20=s
w+8=2(s+8)

w=s+20
s+28=2s+16
s=12

The last
p= pennies
n=nickles
p+5n=1700
P+n=1140
4n=560
140 nickles
1000 pennies

j

j

Answer 2

a million. a million 3/5 + 2 a million/5= 3 4/5 2. 3 3/8 - a million 5/8= 2 11/8 - a million 5/8= a million 6/8= a million 3/4 3. 7 4/9 - 5 8/9= 6 13 /9 - 5 8/9= a million 5/9 4. 3 2/7 + a million 4/5= 3 10/35 + a million 28/35= 4 38/35= 5 3/35 5. 5 2/3 - 2 3/4= 5 8/12 - 2 9/12= 4 20/12 - 2 9/12= 2 11/12 6. 4 - a million 3/4= 3 4/4 - a million 3/4= a million a million/4 7. 2 2/5 + 3 3/5= 5 5/5 =6 8. 4 a million/4 + 5 3/4= 9 4/4 =10 9. 3 x 3 3/4= 3/a million x 15/4 = 40 5/4 = 11 a million/4 10. 4 2/3 x 6/7= 14/3 x 6/7= the 7 is going into the 14 and the three is going into the 6 2/a million x 2/a million=4 11. 2 a million/2 x a million 4/5= 5/2 x 9/5 =9/2= 4 a million/2 12. 3/10 x 8 a million/3= 3/10 x 25/3=5/2

Answer 3

The sum of Anjie's age and Carol's age is 66. Carol's age is 2 more than 3 times Anjie's age. How old are Carol and Najie?

Carol=x
Anjie=y
x+y=66, which is x=66-y
x=3y+2
3y+2=66-y
4y=64
y=16
x=50

Wymon is 20 years older than Sabrina. In 8 years, Wymon will be twice as old as abrina. How old is each now?

Wymon=x
Sabrina=y
x=y+20
x+8=2(y+8);x+8=2y+16;x=2y+8
y+20=2y+8;12=y
y=12
x=32

I would answer all of them but i need to go to bed, i'm tired

Answer 4

D+15=M+10 M+15=2D (the two formulas)
-10 -10
D+5=M

substitute D+5 for M and

(D+5) +15 = 2D
D+20 = 2D
-D -D
20 = David

D+5 = M
20+5 = M
25 = Maya