A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball at random from the bag is three times that of a red ball, find the number of blue balls in the bag?

15

Step-by-step explanation:

Total # of balls = red+blue. Three times = 3× redballs(5), hence 3 × 5 = 15

10

Step-by-step explanation:

Let number of blue balls =x

Total number of balls =5+x

Probability for a red ball = x+5/5

Probability for a blue ball =5+x/x

According to the question 5+x/x=2( x+5/5)⇒x=10 ∴

 Number of blue balls=10.

solution:

we have to construct

∠m nt ≅ ∠p qr

the steps to draw this construction are

step 1: use a compass to draw an arc from point q which intersects the side pq at point a and the side qr at point b.

step 2: draw a segment nt and use the same width of the compass to draw an arc from point n which intersects the segment nt at a point x.

step 3:

step 4: join points n and y using a straightedge.

step 3:

option (d).maintaining the same width of the compass as ab, draw an arc from point x such that it intersects the arc drawn from n in a point y.

to draw   congruent angles , 1. width of compasses while drawing two angles should be same i.e from point at which angle has to be drawn, 2.the distance between the two points where the compass intersects the two sides should be same while drawing any two congruent angles.