1 . If the cost of 8 books is 120, then find the cost of 13 such books.
2 .If a worker is paid 840 for 12 days, how much will he be paid for 7 days?
3. If 12 pencils cost 90, then find the cost of 15 such pencils.
4. The weight of 72 books is 9 kg.
(i) What is the weight of 80 such books? (ii) How many such books weigh 16 kg?
Answers
Answer:
1.The cost of 8 books=120
Each book costs=120÷8=15
13 books cost=13×15=?
13×15=195
2.Money paid for 8 days to worker=840
Each day=840÷8=105
For 7 days=105×7=?
105×7=735
3.12 pencils cost=90
each pencil cost=90÷12=7.5
15 pencils cost=7.5×15=?
7.5×15=112.5
4.(i)weight of 72 books is=9kg
each book weights=72÷9000g(9kg)=125g
80 books weights=125g×80=10000g(10kg)
Answer:
8 book cost = 120
cost of 1 book= 120÷8 = 15
therefore, cost of 13 books= 13 × 15 = 195 rs.
ruppes got I 12 days = 840
so in one day= 840 ÷ 12 = 70
therefore, in 7 days = 70×7 = 490 rs.
cost of 12 pencils = 90
cost of 1 pencils = 90÷12 = 7.5
cost of 15 pencils = 112.5 rs.
weight of 72 books = 9 kg
weight of 1 book= 72÷9 = 8
weight of 80 books= 80×8 = 640 kg
therefore, no.of bks weight 16 kg = 16÷8 = 2 books
Step-by-step explanation:
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