Question

Adam is going to make concrete

He is going to use
180 kg of cement
375 kg of sand
1090 kg of stone

Cement, sand and stone are sold in bags

1 bag cement 1 bag sand 1 bag stone
25kg 22.5kg 50kg

Adam already has
8 bags of cement
19 bags of sand
20 bags of stone
Work out what bags he needs to buy to make the concrete
Working must be shown

Answer 1

90 kg of stone

Explanation:

Adam has 8 x 25 = 200

19 x 22.5 = 427.5

20 x 50 = 1000

He has enough cement and sand

He needs 1090 - 1000 = 90 kg of stone

He needs 2 bags of stone