Evie is making wedding invitation cards in three different colours — blue, green and purple. She uses the different colours in the ratio 2 : 7 : 3. Evie has made 12 green cards so far and has 72 more green cards to make. Work out how many purple cards she will need to make.

she needs to make 36 purple cards.

Step-by-step explanation:

B : G : P

2 : 7 : 3

the 7 units belongs to the green and the qn stated that she needs to make 72 more cards after the 12 that she made in order to have the 7 units of green card.

Thus,

7 units = 12 + 72 = 84

1 unit = 12

3 units(amt of purple cards needed)= 12 × 3 = 36 #

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^