Step-by-step explanation:
The chocolates problem
Let the,
1st group = x
2nd group=4x
3rd group=10 +4x
X+4x+10+4x=100
9x +10=100
9x =100-10
9x = 90
X= 90/10=9
1st group=9
2nd group =36
3rd group= 10+36=46
Age fun
Let Mary be x
Brother be 5+ x
So, x+5+x =33
2x=33-5
2x = 28
X= 28/2 = 14
Mary is 14
Her brother is 19
Isosceles triangle
Let,
Unequal side =1/2x
Each equal side be x
Given, 1/2x =5
So x=10
Each Equal side is 10
Unequal side is 5
Perimeter =x+x+1/2x=5+5+10=20cm
Length of side when perimeter is 80,
80=x+x+1/2x=80
5/2x=80
X= 80*2/5=32
When perimeter is 80,
Length of unequal side is 16
Length of each equal side is 32
George savings is
24
Let nickel be x
Dimes be 1/2x
Quarters be 8+1/2x
Total is 56 coins
8+1/2x+1/2x+x= 56
8+2x =56
2x=48
X=48/2
X= 24
Nickel is x = 24
Dimes is 1/2x = 24/2=12
Quarters is 8+1/2x=8+1/2x
= 8+ 12
= 20
Sorry about the other 2 I was not sure so I didn't send
Even I doubt the 'George's savings' question
