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It's 17. The juice costs 10, fries cost 2 and burger costs 5.
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Glass = x
Burger = y
French fries = z
1st Equation
x+x+x=30
Step 1: Simplify both sides of the equation.
x+x+x=30
(x+x+x)=30(Combine Like Terms)
3x=30
3x=30
Step 2: Divide both sides by 3.
=
x=10
Second Equation ↓
10+ y + y = 20
(y+y)+(10)=20(Combine Like Terms)
2y+10=20
2y+10=20
Step 2: Subtract 10 from both sides.
2y+10−10=20−10
2y=10
Step 3: Divide both sides by 2.
=
y = 5
Third Equation
5 + 2z + 2z = 9
Step 1: Simplify both sides of the equation.
5+2z+2z=9
(2z+2z)+(5)=9 (Combine Like Terms)
4z+5=9
4z+5=9
Step 2: Subtract 5 from both sides.
4z+5−5=9−5
4z=4
Step 3: Divide both sides by 4.
=
z=1
Fourth Equation ↓
x = 10
y = 5
z = 1
5 + 1 × 10
5 + 10
15
Hence the answer of the riddle is = 15
Hope it helps ! :)
Burger = y
French fries = z
1st Equation
x+x+x=30
Step 1: Simplify both sides of the equation.
x+x+x=30
(x+x+x)=30(Combine Like Terms)
3x=30
3x=30
Step 2: Divide both sides by 3.
=
x=10
Second Equation ↓
10+ y + y = 20
(y+y)+(10)=20(Combine Like Terms)
2y+10=20
2y+10=20
Step 2: Subtract 10 from both sides.
2y+10−10=20−10
2y=10
Step 3: Divide both sides by 2.
=
y = 5
Third Equation
5 + 2z + 2z = 9
Step 1: Simplify both sides of the equation.
5+2z+2z=9
(2z+2z)+(5)=9 (Combine Like Terms)
4z+5=9
4z+5=9
Step 2: Subtract 5 from both sides.
4z+5−5=9−5
4z=4
Step 3: Divide both sides by 4.
=
z=1
Fourth Equation ↓
x = 10
y = 5
z = 1
5 + 1 × 10
5 + 10
15
Hence the answer of the riddle is = 15
Hope it helps ! :)
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