Mental Math 11

If the Average of 3 numbers is 15, and two of the numbers are 12 and 17. What is the third number?

• 18

• 45

• 29

• 16

 $\frac{\frac{2}{3\ }+\frac{1}{4\ }+\frac{5}{6\ }+\ \frac{1}{3}+\ \frac{3}{4}+\ \frac{1}{6}}{N}=\ 1$  Find N

• 3

• 1

• 2

• 4

750 kg = ? tonnes

• 75

• .075

• 7.5

• .75

 $\frac{16}{7}=\frac{P}{14}\ find\ P$  

• 21

• 23

• 32

• 37

All of the following are equal to 0.75 except.

• 75%

• $\frac{15}{20}$

• $\frac{5}{7}$

• $\frac{3}{4}$

What decimal fraction of the class do Other Subjects?

• .3

• .1

• .4

• .2

 $640\div8\ is\ not\ equal\ to\ which\ of\ these?$  

•  $\left(640\ x\ \frac{1}{8}\right)$  

• 640 x 8

•  $\frac{600}{8}+\frac{40}{8}$  

•  $640\ \times\frac{1}{2}\times\frac{1}{4}$  

What number goes in the box?

• 6

• 2

• 26

• 25

John left home at 7.00 am and returned 15 hours later. At what time did he return home?

• 7.00 pm

• 10.00 am

• 10.00 pm

• 9.00 pm