Should an estimate or the exact answer be calculated? Then do the appropriate calculation.
For a science experiment, Renny had a container with 150 mL of solution. He transferred 24.8 mL to each of 3 smaller containers and 17.6 mL to each of 2 other small containers. How much solution was left in the original large container?
A.The exact answer is needed. There is 40.4 mL of solution left in the large container. B. An estimate is sufficient. There is about 39 mL left in the large container.

Question

Should an estimate or the exact answer be calculated? Then do the appropriate calculation. 
For a science experiment, Renny had a container with 150 mL of solution. He transferred 24.8 mL to each of 3 smaller containers and 17.6 mL to each of 2 other small containers. How much solution was left in the original large container?
  A.The exact answer is needed. There is 40.4 mL of solution left in the large container.                       B. An estimate is sufficient. There is about 39 mL left in the large container.

anonymous · Answer

please help me

tkhunny · Answer

What's the trick?

Exact Answer

150 - 24.8 - 24.8 - 24.8 - 17.6 - 17.6 =
150 - 3(24.8) - 2(17.6) =
150 - 74.4 - 35.2 = 40.4

One Possible Estimate

24.8 is about 25
17.6 is about 18

150 - 3(25) - 2(18) = 150 - 76 - 36 = 38

Another Possible Estimate

3(24.8) = 74.4 ==> 74
2(17.6) = 35.2 ==> 35

150 - 74 - 35 = 41

How else can you round?