2. There are 100 kids in the park. The boys are 30 more than the girls. How many girls are there in the park?
Solution:
3. A box is full of red and blue pingpong balls. The red pingpong balls are 5 times the number of blue balls. If there are 60 balls in all, how many of each color of balls are there in the box?
Solution:
YAN PA TULONG
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Verified answer
2. let x - no. girls
100 = 30 + x
x = 100 - 30
x = 70 girls
3. let r - red pingpong balls; b for blue
r = 5b > first eqn
60 = b + r > second eqn
substitute r to the 2nd equation
60 = 5b + b
60 = 6b
b = 10
substitute b to the first eqn
r = 5b
r = 5(10)
r = 50
blue = 10 ; red = 50