1 . If the cost of 8 books is 120, then find the cost of 13 such books

1.	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?
Answer» 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)

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?

Answer»

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)