A group of preschoolers has 63 boys and 27 girls. What is the ratio of boys to all children (lowest form)?

63:90= 7:10

Reasoning:
add up the total amount of preschoolers which is 90, and the amount of boys in the group of children which is 63. so it would be 63:90. 9 goes into both numbers. (63 divided by 9= 7. 90 divided by 9 is 10.) so the answer would be 7:10 in simplified form.

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.