Toby gets a haircut every 6 th week on a Tuesday. Lacy gets a haircut every 9 th week on a Tuesday. Suppose Toby and Lacy both get a haircut on the same Tuesday. During what week do Toby and Lacy get their next haircut on the same Tuesday? Explain your answer.

What is the absolute value of \( -12 + 4 \)?

number of girls is \( 9: 7 \). Find the number of boys if the total number of students is 3200 . 19. The sides of a triangle are in the ratio of \( 2: 3: 4 \). If the perimeter is 72 cm , find its sides. 20. In a factory the ratio of number of defective bolts produced to the number of good bulbs is \( 1: 10 \). In one hour the factory produced 330 bolts. Find the number of defective bulbs produced by the

If \( 3^2 \) is calculated, what is the result?

\( \frac{3}{\frac{3}{4}} \) of \( \frac{4}{9} \div 9 \frac{1}{2} \)

19. The sides of a triangle are in the ratio of \( 2: 3: 4 \). If the perimeter is 72 cm , find its sides. 20. In a factory the ratio of number of defective bolts produced to the number of good bulbs is \( 1: 10 \). In one hour the factory produced 330 bolts. Find the number of defective bulbs produced by the factory in an hour. 21. The present age of father is 45 years and her daughter is 20 years. Find the ratio of (a) present age of father to present age of daughter. (b) age of farther to the age of daughter when daughter was 15 year old. (c) age of daughter to father when father was (c) vears old.