Teresa has 19, Manual has 57, and John has 25
Here’s how to do it:
2 figures are congruent if at least 2 sides are the same length, there angles are the same, etc
48 girls are there. Given that there is a ratio of boys to girls of 7:8. Then divide 42 boys by 7 boys which equals 6. After, multiply 6 by 8 girls equals 48 girls.
Answer:
x is given as -1.5. Substitute to confirm