Answer:
30
Step-by-step explanation:
He draws 40 chips, out of which 12 pink
Probability of pink is 12 out of 40
Making a proportion
12/40= ?/100
? =30
Answer:
The number is 240
Step-by-step explanation:
<u>Step 1: Make an expression
</u>
0.3 * n = 72
0.3n = 72
<u>Step 2: Divide both sides by 0.3
</u>
0.3n / 0.3 = 72 / 0.3
n = 240
Answer: The number is 240
To do so you find the opposites of each number so it would be
2a-3b
∈ means '(is) an element of'
For instance, 'Let a ∈ A' means 'Let a be an element of A'
http://en.wikipedia.org/wiki/Element_(mathematics) might help you too