First you need to use your information to set up a proportion. (put your parts over the wholes and a variable in the blank spot.
<u>part </u> <u> part</u>
whole whole
<u>2 </u> <u>6</u>
x 150
Now you use the butterfly method, cross multiply the numerator and denominator and then divide that answer by the remaining numerator or denominator. This will give you the missing value for your variable.
Step-by-step explanation: The parenthesis with no operation in between is multiplication. double negative makes a positive so its 7 times 5 which is 35.