1.) 20 bananas cost 16.80. Find the
co of 15 bananas.
please give me answer with explanation
Answers
Answer:
Cost of 15 bananas = Rs.12.60
Step-by-step explanation:
We can solve this problem in 2 ways,
Method 1 (Unitary method)
We have,
Cost of 20 bananas = Rs.16.80
Then,
Cost of 1 banana = 16.80/20
Cost of 1 banana = Rs.0.84
Hence,
Cost of 15 bananas = 0.84 × 15
Cost of 15 bananas = Rs.12.60
Thus,
Cost of 15 bananas = Rs.12.60
Method 2 (Proportionality method)
Cost of bananas will always be the same, so there are proportional.
Cost of 20 bananas = Rs.16.80
Let the cost of 15 bananas be Rs.x
Hence,
16.80 : 20 :: x : 15
We know that,
Product of means = Product of extremes
20 × x = 16.80 × 15
20x = 252
x = 252/20
x = 12.60
OR
16.80/20 = x/15
Cross multiplying we get,
16.80 × 15 = 20 × x
20x = 252
x = 252/20
x = 12.60
Hence,
Cost of 15 bananas = Rs.12.60
Hope it helped and believing you understood it........All the best