1) (490 : 7) * 2 = 140
2) (900 : 100 )* 15 = 135
3) (56:14) * 100= 400
4) (640 : 8) * 10 = 800
1) 7/7=490
1/7=70
2/7=140
2)900=100%
900*15%/100%=13500/100%=135
15%=135
3) x=100%
56=14%
14x=5600
x=400
4)8/10=640
1=x
8/10x=640
x=800
1) (490 : 7) * 2 = 140
2) (900 : 100 )* 15 = 135
3) (56:14) * 100= 400
4) (640 : 8) * 10 = 800
1) 7/7=490
1/7=70
2/7=140
2)900=100%
900*15%/100%=13500/100%=135
15%=135
3) x=100%
56=14%
14x=5600
x=400
4)8/10=640
1=x
8/10x=640
x=800