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1. 92% of what number is 69?
2. 20% of what number is 3.4?
3. 10% of what number is 80?
4. 4% of what number is 25?



Sagot :

We have to use proportion
92% -------------69
100% -----------x
x=69*100:92=75

20% ---------------3.4
100% --------------x
x=100*3.4:20=17

10% -------------80
100% -----------x
x=100*80:10=800

4%  ------------------25
100% --------------x
x=100*25:4=625 
leher
1) 92%of x=69
   92/100 of x=69
0.92x=69
x=69/0.92
x=75


2) 20% of x=3.4
    20/100 of x=3.4
0.2x=3.4
x=3.4/0.2
x=17


3)10% of x=80
   10/100 of x=80
0.1x=80
x=80/0.1
x=800


4) 4% of x=25
    4/100 of x=25
 0.04x=25
x=25/0.04
x=625.............
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