The ratio of white marble and black marble is 1: 2. If the ratio of white, black and red marble by adding 7 red marble. 2: 4: 3, so tell us how much is black marble ? plz solve​

step-by-step explanation:

sorry i don't know. i am not good at maths .

edge an absolute necessity be under 90 if abc is an unfeeling triangle. when you include the measures of every one of the three points in a triangle, generally signify 180 degrees.

it doesn't make a difference how huge or little the triangle is, or how or fat it is. it's a triangle . the points dependably indicate 180 degrees.