You would multiply the students by the price (12*10=120) then multiply chaperones by price (6*15=90) then add both prices together to get 210. Then you would subtract 210 from 380 to get how many boys are in the class. 380-210=170. Since each student cost 10 so you would divide 170/10=17. There would be 17 boys in your class.
Answer:
PRT%
Step-by-step explanation:
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Answer:
<h2>for 14 is Surface are =2*(7*5+7*3+5*3)= 142 feet cube </h2>
for 13 Surface are= 2*(9*7.2+9*9+7.2*9)= 421 m cube