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A bag contains 90 balls.
The ratio of red to blue to yellow balls is 2:7:1
Find how many red, blue and yellow balls there are.

Respuesta :

r+b+y=90
k=90:3=30
r=2*k=60
b=7*k=210
y=1*k=30
S1NGH

Answer:

18 red, 63 blue and 9 yellow

Step-by-step explanation:

→ Add the ratios together

90 ÷ ( 2 + 7 + 1 ) = 9

→ Multiply each ratio by

2 × 9 = 18 red

7 × 9 = 63 blue

1 × 9 = 9 yellow

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