Bulgaria Vtoro OU „ Nikola I . Vapcarov “
Activities 3 Find the fourth proportional x if :
Verification of the acquired knowledge and skills for the new concepts , application the basic property of the proportions and the finding of an unknown member of the proportion . 2 part 1 . Apply proportions in text tasks where one of the dimensions is known and the other dimension is searched . 1 ) The parsley contains vitamin A and vitamin C in a 1 : 15 ratio . How many milligrams of vitamin A have in parsley containing 45 milligrams of vitamin C ? 2 ) In the 6th grade boys girls are in a 3 : 5 ratio . The number of boys is 12 years . What is the number of girls ?
11