? Cost of 15 eggs = ? 75
? Cost of 1 egg = ? 75/15
? Cost of 4 dozens (4 x 12) = Cost of 48 eggs
= (75/15) x 48 = ? 240
? Cost of 12 pens = ? 84
Cost of 1 pen = ? 84/12
? Cost of 10 pens = (84/12) x 10
= 7 x 10 = ? 70
Let the required cost be ? N.
More orange, more cost (Direct proportion)
24 : 120 : : 72 : N
? N = (120 x 72)/24 = ? 360
Cost of 20 articles = ? 90
Cost of 1 article = ? 90/20
? Cost of 9 article = 9 x 90/20 = ? 40.50
39.8% of 400 + ?% of 350 = 230
? 159.2 + (350 x ?)/100 = 230
&Arr; ? = (230 - 159.2) x 100/360 = 20.23 = 20
0.0005 x 76 x 103 + ? = 170% of 29.98
? 0.038 x 1000 + ? = (30 x 170)/100
? ? = 51- 38 = 13 ? 12
Let the required number of bananas be N.
16 dozens bananas = 16 x 12 = 192 bananas
Less bananas, Less cost (Direct proportion)
360 : 60 : : 192 : N
? N = (60 x 192)/360 = 32 bananas
Let number of toys be N.
More hours, More toys (Direct proportion)
2 : 80 : : 1 : N
? N = 80/2 = 40 toys
Let the required weight be w kg.
Less length, Less weight (Direct proportion)
45 : 12 :: 171 : w
? w = (12 x 171)/45 = 45.6 kg
? Distance covered in 20 min = 5 km
? Distance covered in 1 min = 5/20 km
? Distance covered in 100 min = (5/20) x 100
= 5 x 5 = 25 km
? 8 m shadow means original height = 12 m
? 1 m shadow means original height = 12/8 m
? 100 m shadow means original height = (12/8) x 100 m
= (6/4) x 100 = 6 x 25 = 150 m
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